How Many Life Years Have Been Saved In The United States From Using Rituximab Plus Chemotherapy Compared To Chemotherapy Alone From 1998-2013

Blood ◽  
2013 ◽  
Vol 122 (21) ◽  
pp. 2937-2937
Author(s):  
Mark Danese ◽  
Michelle Gleeson ◽  
Marc Halperin ◽  
Sandra Skettino ◽  
Carolina Reyes

Abstract Introduction Rituximab was approved in December 1997 and has since become the standard of care in diffuse large B-cell lymphoma (DLBCL), follicular lymphoma (FL), and chronic lymphocytic leukemia (CLL). Clinical trials have shown statistically significant improvements in progression-free and overall survival. The objective of this study was to estimate the real-world effectiveness of first-line rituximab plus chemotherapy (R+Chemo) relative to chemotherapy alone (Chemo Alone) in the United States (US) from 1998 to 2013. Methods For each cancer, we constructed a population effectiveness model from 1998-2013 comprised of 3 modules: epidemiology, utilization and survival. The epidemiology module included age group, gender, and year-specific incidence rates for each cancer from the Surveillance, Epidemiology, and End Results (SEER) program from 2000-2010. Published SEER-based join-point estimates were used to extrapolate to other years. Census population data using the same age group, gender, and year strata were combined with incidence rates to project total diagnosed patient counts. The utilization module was based on SEER-Medicare linked data from 1999-2009. Drug utilization (defined as first infusion within 180 days of diagnosis for each cancer) for R+Chemo and for Chemo Alone was estimated as a proportion of all diagnosed patients, and stratified by age group, gender, and calendar year of diagnosis in the SEER-Medicare data. Utilization proportions were then multiplied by the diagnosed population counts to estimate treated patient counts for each cancer, by age group, gender, and calendar year. The survival module was calculated using SEER-Medicare data, starting from 30-days after first infusion, with follow up through 12/31/2010. For each cancer, flexible parametric (Royston-Parmar) survival models were applied to estimate restricted (10-year) mean survival times for each person, adjusted for individual patient covariates. These estimates were averaged across patients within strata defined by age group, gender and treatment. Life years lived were estimated for patients receiving R+Chemo, first by using mean survival for treatment with R+Chemo, and then by using mean survival estimates for Chemo Alone. The incremental life years saved were calculated as the difference between the projected survival from using R+Chemo and from using Chemo Alone. These differences were summed over age group, gender, and calendar year for each cancer. Monte Carlo sampling was used to estimate the 95% uncertainty intervals (UI). Results Across all three cancers, there were 289,793 cumulative life years saved (95% UI, 248,300-330,618; see Figure) from 1998 to 2013. For DLBCL, an estimated 177,952 patients were treated with R+Chemo. In these patients, an estimated 199,323 (95% UI 169,534-231,214) additional life years were lived compared to what might have occurred if Chemo Alone had been used instead. For FL, an estimated 84,303 patients were treated with R+Chemo, and an additional 80,338 (95% UI 53,876-106,709) life years were lived compared to Chemo Alone. For CLL, an estimated 14,398 patients were treated with R+Chemo, and an additional 10,132 (95% UI 4,469-15,998) life years were lived compared to Chemo Alone. Conclusions For DLBCL, FL and CLL patients treated with first-line therapy within 180 days of diagnosis in the US, approximately 290,000 cumulative life years were saved by adding rituximab to chemotherapy between 1998 and 2013. Next generation therapies may be able to extend these survival gains for patients with CLL, FL and DLBCL. Disclosures: Danese: Amgen: Consultancy, Research Funding; Genentech: Consultancy, Research Funding; Medimmune: Consultancy, Research Funding. Gleeson:Amgen, Inc.: Consultancy, Research Funding; Genentech: Consultancy, Research Funding; MedImmune: Consultancy, Research Funding. Halperin:Genentech: Consultancy, Research Funding; Medimmune: Consultancy, Research Funding; Amgen: Consultancy, Research Funding. Skettino:Genentech: Employment, stock Other. Reyes:Genentech, inc: Employment, Equity Ownership.

Author(s):  
Aditya Patel ◽  
Samrudhi Gujar ◽  
Savita Pohekar ◽  
Ruchira Ankar ◽  
Arati Raut ◽  
...  

Introduction: Hodgkin's and non-lymphomas Hodgkin's are malignant tumours of lymphoid tissue. Non-lymphomas Hodgkin's are a type of lymphoid tissue cancers that arise from T or B cells or their progenitors, and can be indolent or aggressive. B-cell lymphomas account for around 80% of all cases in the United States. Chronic lymphocytic leukaemia or small lymphocytic lymphoma, follicular lymphoma, diffuse large B-cell lymphoma, and primary cutaneous B-cell lymphoma are all examples of Non-Hodgkin's Lymphoma. Non-Lymphoma Hodgkin's is the sixth most prevalent malignancy in the United States, with incidence rates nearly doubling in the last 35 years. With each decade of life, the incidence rises; the median age upon diagnosis is 66. In India, the incidence rates in urban regions are many times higher than in rural areas, with the incidence being higher in metropolitan cities and among Indian immigrants, implying that urban lifestyles and economic advancement may boost cancer incidence. In 2010, NHL was projected to have caused roughly 0.36 million new cases and 0.19 million deaths. Case Presentation: A male patient of Two and half years from Shiwangaon MO, was admitted to Paediatric Ward, AVBRH on 31st May, 2021 with a known case of Non-Hodgkin Lymphoma which was diagnosed itself at AVBRH on 31st May,2021. My patient was brought with a chief complain of swelling in the testicular region for 6 days. As narrated by the patient’s father, my patient was apparently alright 6 months back and then patient develop swelling in temporal region suddenly, associated with pain on touch, as the swelling develops more and uncomfortable, patient was brought immediately to AVBRH and was admitted in Paediatric Ward for further investigation.


2019 ◽  
pp. 1-10
Author(s):  
Rafil T. Yaqo ◽  
Sana D. Jalal ◽  
Kharaman J. Ghafour ◽  
Hemin A. Hassan ◽  
Michael D. Hughson

PURPOSE In the Middle East, incidence rate ratios (IRRs) of non-Hodgkin lymphoma (NHL) to Hodgkin lymphoma (HL) are more than 50% lower than the United States. MATERIALS AND METHODS Age-specific incidence rates (ASIRs), age-adjusted incidence rates (AAIRs), and IRRs of NHL:HL were compared using the cancer registries of Iraq, Jordan, Saudi Arabia, and US SEER. RESULTS The NHL AAIR (95% CI) per 100,000 population was 4.4 (4.1 to 4.7) for Iraq, 5.4 (4.6 to 6.2) for Jordan, 4.7 (4.4 to 5.1) for Saudi Arabia, and 13.2 (13.0 to 13.4) for the United States. The HL AAIR was 1.8 (1.6 to 2.0) for Iraq, 1.8 (1.4 to 2.2) for Jordan, 2.1 (1.9 to 2.2) for Saudi Arabia, and 2.3 (2.2 to 2.4) for the United States, with respective NHL:HL IRR of 2.4 (2.2 to 2.7), 3.0 (2.4 to 3.8), 2.2 (2.0 to 2.5), and 5.7 (5.5 to 6.0). NHL ASIRs for the Middle East and the United States were similar until 30 to 39 years of age. Thereafter, ASIR of NHL peaked at 20 to 33 per 100,000 at age 70 years in the Middle East regions, all much lower than the US age 70 years rate of greater than 100 per 100,000. Diffuse large B-cell lymphoma (DLBCL) represented 52% of NHL in Sulaimaniyah Province of Iraq and 51% of NHL in Saudi Arabia. Both regions had AAIR for DLBCL less than 42% of DLBCL in US SEER. Pediatric Epstein-Barr virus–related Burkitt’s lymphoma at 8% was the second most frequent NHL in Sulaimaniyah but made little contribution to overall NHL rates. CONCLUSION The incidence of HL was slightly lower than in the United States, but it was the markedly lower rates of adult NHL with advancing age, including the predominant DLBCL, that accounted for the low NHL:HL IRR in these Middle Eastern countries.


Blood ◽  
2018 ◽  
Vol 132 (Supplement 1) ◽  
pp. 1857-1857
Author(s):  
Yucai Wang ◽  
Marcella Tschautscher ◽  
Kari G. Chaffee ◽  
Timothy G. Call ◽  
Jose F. Leis ◽  
...  

Abstract Introduction: Richter transformation (RT) refers to transformation of chronic lymphocytic leukemia (CLL) to an aggressive lymphoma, most commonly diffuse large B-cell lymphoma (DLBCL). Most studies on the management of RT were either small retrospective series or early phase non-randomized trials before the era of novel agents. The natural history, prognostication and optimal treatment of patients with RT remain undefined. Here we report the clinical characteristics and outcomes of a large series of RT from a single center. Methods: Biopsy-confirmed RT (limited to non-Hodgkin lymphoma) diagnosed from 4/1993 to 4/2018 were identified from the Mayo Clinic CLL database. Clinical characteristics, treatment information and follow-up data were abstracted by chart review. Overall survival (OS) was defined as time from RT diagnosis to death from any cause and analyzed using the Kaplan-Meier method. Statistical analysis was done in SAS 9.4. Results: A total of 204 patients with CLL who developed RT were identified. The median age at CLL diagnosis was 62 years (range 22-85), and 148 (73%) were male. The median time to transformation was 4.7 years (range 0-34.5). Prior to RT, 68 (33.3%) patients received no treatment for CLL, 109 (53.4%) received chemoimmunotherapy (CIT) only, and 27 (13.2%) received at least one novel agent (idelalisib, ibrutinib, or venetoclax) for CLL. The median lines of CLL therapy prior to RT was 2 (range 0-13). The median age at RT diagnosis was 69 years (range 30-88). Pathology of RT was DLBCL and high grade B-cell lymphoma in 193 (94.6%) and 11 (5.4%) patients, respectively. The median LDH was 306 IU/L (range 99-9000). 62/125 (49.6%) patients had bulky disease (≥ 5 cm), and the median PET SUVmax was 13.9 (range 2.9-30.0). 45/131 (34.4%) patients had del(17p) or TP53 mutation, 12 (9.2%) had del(11q), 21 (16.0%) had trisomy 12, 27 (20.6%) had del(13q), and 25 (19.1%) had normal FISH. The CLL and RT were clonally related in 12/21 (57.1%) patients. For the transformed lymphoma, cell of origin by Han's algorithm was germinal center B cell-like (GCB) and non-GCB in 31/100 (31.0%) and 69/100 (69.0%) patients, respectively. EBV was positive in 14/52 (26.9%) patients. The median Ki-67 was 80% (range 10-100). Myc and Bcl-2 were positive by IHC in 31/43 (72.1%) and 83/103 (80.6%) patients, respectively; 27/56 (48.2%) were double-expressors. MYC, BCL2, and BCL6 rearrangement was positive by FISH in 18/68 (26.5%), 10/34 (29.4%), and 4/31 (12.9%) patients, respectively; 8/66 (12.1%) were double/triple-hit. The most common first-line treatment (Table 1 notes) of RT was R-CHOP-like regimen (n=114, 65.5%). Other treatments included R-EPOCH-like (n=6, 3.4%), high-intensity chemotherapy (n=15, 8.6%), novel agents (eg, ibrutinib, venetoclax, pembrolizumab; n=19, 10.9%), other chemotherapy (n=12, 6.9%), and palliative therapy (n=8, 4.6%). Response to first-line treatment was CR in 57 (38.0%), PR in 33 (22.0%), SD in 18 (12.0%), and PD in 42 (28.0%) patients. The median OS of the entire cohort after RT diagnosis was 12.0 months. The median OS for patients who received no prior CLL treatment, CIT only or at least one novel agent for CLL were 65.5, 7.3, and 12.0 months, respectively (P<0.0001; Figure 1). Of note, in patients who received CIT only for CLL, ~10% and 60% received high-intensity and R-CHOP/R-EPOCH-like chemotherapy, respectively, as first-line RT therapy. In contrast, in patients who had prior novel agents for CLL, 56% and 26% were treated with novel agents and R-CHOP/R-EPOCH-like chemotherapy, respectively, as first-line RT therapy. Patients with or without del(17p)/TP53 mutation had a median OS of 8.3 and 12.8 months, respectively (P=0.046). Patients who were treated with high intensity chemotherapy, R-CHOP/R-EPOCH-like regimens, novel agents, and other therapies for RT had a median OS of 35.1, 14.4, 10.9 and 6.1 months, respectively (P=0.02; Figure 2). OS comparisons by CLL/RT clonal relationship, double expressor or double/triple-hit status are shown in Table 1, with no significant differences noted. Conclusions: Over two thirds of RT were the non-GCB subtype, and about half were Myc/Bcl-2 double expressors. Patients who developed RT without prior CLL therapies had a significantly better OS. In contrast, patients who had received prior CLL therapies had poor outcomes. Myc/Bcl-2 double expressor and MYC/BCL2/BCL6 double/triple hit status had no impact on OS. Disclosures Kenderian: Humanigen: Research Funding; Novartis: Patents & Royalties; Tolero Pharmaceuticals: Research Funding. Kay:Infinity Pharm: Membership on an entity's Board of Directors or advisory committees; Celgene: Membership on an entity's Board of Directors or advisory committees; Agios Pharm: Membership on an entity's Board of Directors or advisory committees; Morpho-sys: Membership on an entity's Board of Directors or advisory committees; Tolero Pharmaceuticals: Membership on an entity's Board of Directors or advisory committees, Research Funding; Janssen: Membership on an entity's Board of Directors or advisory committees; Acerta: Research Funding; Cytomx Therapeutics: Membership on an entity's Board of Directors or advisory committees; Pharmacyclics: Membership on an entity's Board of Directors or advisory committees, Research Funding; Gilead: Membership on an entity's Board of Directors or advisory committees. Parikh:Janssen: Research Funding; Abbvie: Honoraria, Research Funding; AstraZeneca: Honoraria, Research Funding; MorphoSys: Research Funding; Gilead: Honoraria; Pharmacyclics: Honoraria, Research Funding. Ding:Merck: Research Funding.


2013 ◽  
Vol 31 (15_suppl) ◽  
pp. 7086-7086
Author(s):  
Christopher Flowers ◽  
Charles Michael Farber ◽  
Ian Flinn ◽  
David L. Grinblatt ◽  
Neil E. Kay ◽  
...  

7086 Background: The HRQOL of patients (pts) with chronic lymphocytic leukemia (CLL) has not been adequately delineated across patient, disease and treatment characteristics. We evaluated HRQOL of CLL pts undergoing treatment in the United States (US) by age, gender and line of therapy. Methods: Data were collected in Connect CLL, a prospective observational US registry. Physicians provided data on demographics, clinical characteristics and line of therapy at enrollment. HRQOL was self-reported by pts at enrollment using the Functional Assessment of Cancer Therapy-Leukemia, an instrument that yields a leukemia-specific total HRQOL score (FACT-Leu) and a cancer-specific total HRQOL score (FACT-G). Mean total scores were analyzed by line of therapy, age and gender. Statistical significance was ascertained by ANOVA using SAS 9.2. Multivariate analyses were conducted to assess the relative association of line of therapy, age and gender with HRQOL. Results: Among 1,252 pts enrolled from 161 geographically diverse centers (90% community, 8% academic, 2% veterans/military), pts were predominantly male (63%), white (89%) with mean age 69 yrs. Pts were categorized by line of therapy at enrollment: First 61%, Second 18%, Third 11%, Higher 9%; and by age group: <65 33%, 65-74 35%, 75+ 32%. Univariate analyses suggested that the total FACT-Leu score was significantly better in men than women (P=0.004); in pts aged 65-74 vs younger or older pts (P=0.033); and in pts initiating first-line treatment vs pts receiving subsequent treatments (P=0.0002). Similar results were found with the FACT-G score except that gender differences were not statistically significant. Multivariate analysis confirmed that line of therapy (P=0.007), gender (P<0.0001), and age group (P=0.039) were each associated with significant differences in the FACT-Leu total score. Conclusions: Results from the Connect CLL Registry indicate that HRQOL is better among pts initiating first-line therapy compared to pts initiating subsequent treatments, and that this remains true when age and gender are considered. Future analyses should determine how HRQOL may change over time relative to treatment and treatment response.


Blood ◽  
2015 ◽  
Vol 126 (23) ◽  
pp. 2951-2951 ◽  
Author(s):  
Kerry A. Rogers ◽  
Galena Salem ◽  
Deborah M. Stephens ◽  
Leslie A. Andritsos ◽  
Farrukh T. Awan ◽  
...  

Abstract Background: Richter's transformation (RT), the occurrence of an aggressive lymphoma in patients with prior chronic lymphocytic leukemia (CLL), occurs in up to 10% of CLL patients. Anthracycline-based chemoimmunotherapy remains standard, but outcomes are poor (median survival approximately 12 months). R-EPOCH (rituximab, etoposide, prednisone, vincristine, cyclophosphamide, and doxorubicin) has demonstrated superior efficacy to R-CHOP in HIV-associated diffuse large B-cell lymphoma, Burkitt's lymphoma, and primary mediastinal B-cell lymphoma. We conducted a single-institution retrospective cohort study to characterize efficacy and toxicity of R-EPOCH as first-line treatment for RT. Methods: The study included patients treated with R-EPOCH as first-line therapy for histologically confirmed RT at the Ohio State University between January 1st 2006 and May 31st 2014. Characteristics of the CLL and RT, ECOG performance status, and laboratory assessment of bone marrow and organ function were abstracted from medical records. Toxicity of R-EPOCH was assessed by reviewing the frequency of adverse events (AE). R-EPOCH treatment outcomes were assessed as documented by the treating physician and not secondarily verified. Progression free survival (PFS) and overall survival (OS) durations were calculated from date of Richter's biopsy until date of event (PFS: relapse/death; OS: death), censoring patients without event at last follow-up. PFS and OS estimates were obtained using the Kaplan-Meier method. Univariable proportional hazards models were used to model PFS and OS as a function of each clinical variable. Results: The study included 46 patients. Median age at RT diagnosis was 67 (range 38-83). Median number of months from CLL to RT diagnosis was 53 (range 0.4-198). A median of 3 (range 0-13) prior CLL treatments had been given with 10 (22%) patients receiving ibrutinib as the most recent. The majority of patients where CLL risk was evaluable demonstrated poor-risk disease: 24/43 (56%) complex karyotype, 20/41 (49%) del(17)(p13.1), 27/32 (84%) unmutated IGHV. The majority of evaluable patients had an ECOG performance status of 0 or 1 (18/28, 64%). Table 1 shows RT characteristics for these patients. Treatment with R-EPOCH was started a median of 5 days after RT diagnosis (range 0-110). The majority of patients did not complete 6 cycles: 16 (35%) completed 1 cycle, 10 (22%) 2 cycles, 5 (11%) 3 cycles, 4 (9%) 4 cycles, 2 (4%) 5 cycles, and 9 (19%) 6 cycles. Of 131 cycles given, 114 (87%) were fully evaluable for AE with results in table 2. Outcome of R-EPOCH treatment was known for 44 patients: 9 (20%) achieved complete response, 8 (18%) clinical response documented by the treating physician, 14 (32%) progressive disease, and 13 (30%) died without (known) lymphoma progression. With a median follow up of 39 (range 13-54) months, 9 (20%) patients were alive without lymphoma progression. All patients with lymphoma progression died. Median PFS was 3.5 months (95% CI: 2.0-7.6) and median OS was 5.9 months (95% CI: 3.2-10.3) (Figure 1). In univariable analysis, risk of death was higher for patients with complex CLL karyotype (HR 4.38, p=0.0002), del(17)(p13.1) (HR 3.04, p=0.003), higher number of CLL treatments (HR 1.16, p=0.004), higher bilirubin (HR 1.68, p=0.04), and higher serum creatinine (HR 1.65, p=0.05). Conclusions: Patients with RT treated with first-line R-EPOCH had poor PFS (median 3.5 months) and OS (median 5.9 months) with only 20% of patients alive at last follow up. Characteristics of underlying CLL influenced outcomes of R-EPOCH with worse PFS and OS in deletion 17p and complex karyotype patients. Better therapies for RT are urgently needed, especially in patients with poor risk CLL. Table 1. Characteristics of Aggressive Lymphoma n=46 Histology, no. (%)- Large Cell- Early large-cell/Prolymphocytic- Plasmablastic (EBV+)- High-grade B-cell 42 (91) 2 (4) 1 (2) 1 (2) Extranodal Disease- Yes- No 20 (43) 26 (57) Bulky Disease, no. (%)- Yes ≥5, <10 cm- Yes ≥10 cm- No- Unknown 16 (42) 8 (21) 14 (37) 8 Table 2. Adverse Events by Cycle Cycle 1 (n=40) Cycle 2 (n=29) Cycle 3 (n=15) Cycle 4 (n=12) Cycle 5 (n=11) Cycle 6 (n=7) Any AE* Infection Neutropenic Fever Hospitalization ICU Stay 29 (72%) 14 14 14 4 17 (59%) 7 4 7 0 7 (47%) 1 0 1 0 4 (33%) 1 0 1 0 2 (18%) 1 1 1 0 1 (14%) 0 0 1 0 *Hospitalization, infection, neutropenic fever, non-neutropenic fever, ICU stay, transfusion, mucositis, fatigue requiring treatment delay, and ileus. Disclosures Stephens: Immunomedics: Research Funding; Acerta Pharma BV: Research Funding. Byrd:Acerta Pharma BV: Research Funding. Maddocks:Janssen: Research Funding; Novartis: Research Funding; Pharmacyclics: Consultancy, Research Funding. Jones:AbbVie: Research Funding; Pharmacyclics LLC, an AbbVie Company: Consultancy, Research Funding.


2015 ◽  
Vol 18 (6) ◽  
pp. 876-883 ◽  
Author(s):  
Mark D. Danese ◽  
Anthony Masaquel ◽  
Eduardo Santos ◽  
Melissa Brammer ◽  
Abraham Lee ◽  
...  

2017 ◽  
Vol 35 (2) ◽  
pp. 166-174 ◽  
Author(s):  
Qiushi Chen ◽  
Nitin Jain ◽  
Turgay Ayer ◽  
William G. Wierda ◽  
Christopher R. Flowers ◽  
...  

Purpose Oral targeted therapies represent a significant advance for the treatment of patients with chronic lymphocytic leukemia (CLL); however, their high cost has raised concerns about affordability and the economic impact on society. Our objective was to project the future prevalence and cost burden of CLL in the era of oral targeted therapies in the United States. Methods We developed a simulation model that evaluated the evolving management of CLL from 2011 to 2025: chemoimmunotherapy (CIT) as the standard of care before 2014, oral targeted therapies for patients with del(17p) and relapsed CLL from 2014, and for first-line treatment from 2016 onward. A comparator scenario also was simulated where CIT remained the standard of care throughout. Disease progression and survival parameters for each therapy were based on published clinical trials. Results The number of people living with CLL in the United States is projected to increase from 128,000 in 2011 to 199,000 by 2025 (55% increase) due to improved survival; meanwhile, the annual cost of CLL management will increase from $0.74 billion to $5.13 billion (590% increase). The per-patient lifetime cost of CLL treatment will increase from $147,000 to $604,000 (310% increase) as oral targeted therapies become the first-line treatment. For patients enrolled in Medicare, the corresponding total out-of-pocket cost will increase from $9,200 to $57,000 (520% increase). Compared with the CIT scenario, oral targeted therapies resulted in an incremental cost-effectiveness ratio of $189,000 per quality-adjusted life-year. Conclusion The increased benefit and cost of oral targeted therapies is projected to enhance CLL survivorship but can impose a substantial financial burden on both patients and payers. More sustainable pricing strategies for targeted therapies are needed to avoid financial toxicity to patients.


Author(s):  
Cushla M Coffey ◽  
Sarah A Collier ◽  
Michelle E Gleason ◽  
Jonathan S Yoder ◽  
Martyn D Kirk ◽  
...  

Abstract Background Giardiasis is the most common intestinal parasitic disease of humans identified in the United States (US) and an important waterborne disease. In the United States, giardiasis has been variably reportable since 1992 and was made a nationally notifiable disease in 2002. Our objective was to describe the epidemiology of US giardiasis cases from 1995 through 2016 using National Notifiable Diseases Surveillance System data. Methods Negative binomial regression models were used to compare incidence rates by age group (0–4, 5–9, 10–19, 20–29, 30–39, 40–49, 50–64, and ≥ 65 years) during 3 time periods (1995–2001, 2002–2010, and 2011–2016). Results During 1995–2016, the average number of reported cases was 19 781 per year (range, 14 623–27 778 cases). The annual incidence of reported giardiasis in the United States decreased across all age groups. This decrease differs by age group and sex and may reflect either changes in surveillance methods (eg, changes to case definitions or reporting practices) or changes in exposure. Incidence rates in males and older age groups did not decrease to the same extent as rates in females and children. Conclusions Trends suggest that differences in exposures by sex and age group are important to the epidemiology of giardiasis. Further investigation into the risk factors of populations with higher rates of giardiasis will support prevention and control efforts.


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