Transmission of urinary schistosomiasis in Sukumaland, Tanzania. 1. Snail infection rates and incidence of infection in school children

1988 ◽  
Vol 62 (3) ◽  
pp. 213-217 ◽  
Author(s):  
N. J. S. Lwambo
Keyword(s):  
School Children ◽  
Incidence Rates ◽  
Density Fluctuations ◽  
Water Volume ◽  
Infection Rates ◽  
Snail Infection ◽  
Dry Period ◽  
Urinary Schistosomiasis ◽  
Seasonal Incidence ◽  
Transmission Period

ABSTRACTSeasonal density fluctuations of Bulinus nasutus populations with accompanying Schistosoma haematobium infection rates in relation to rainfall and habitat water volumes were studied at Ukiriguru, Mwanza, Tanzania. Alongside the snail investigations, 50 school children initially negative for urinary schistosomiasis were examined regularly to determine seasonal incidence rates for the infection. Of the 17 646 B. nasutus collected in 2 years, 156 (0.88%) were found shedding cercariae. Snail populations fluctuated seasonally as influenced by rainfall through its effects on habitat water volume. Monthly snail infection rates ranged from 0.09% to 3.19% and were highest in February and March, at the time of the short dry period. Monthly incidence of S. haematobium in school children ranged between 2.6% and 12.5%, being highest in April and May. There was a significant linear association between monthly snail infection rates and S. haematobium incidence rates in school children ( in 1983/84) suggesting that the maximum transmission period for urinary schistosomiasis in the area occurs during the short dry period, sometime in February/March so that most of the infections in the community would be detected in April/May.

scholarly journals Efficacy of praziquantel against urinary schistosomiasis and reinfection in Senegalese school children where there is a single well-defined transmission period

2015 ◽  
Vol 8 (1) ◽  
Author(s):  
Bruno Senghor ◽  
Omar Talla Diaw ◽  
Souleymane Doucoure ◽  
Seydou Nourou Sylla ◽  
Mouhamadane Seye ◽  
...  
Keyword(s):  
School Children ◽  
Urinary Schistosomiasis ◽  
Single Well ◽  
Transmission Period

Urinary schistosomiasis in rural communities of some Local Government Areas in Plateau State, Nigeria: a preliminary parasitological and malacological Survey

1996 ◽  
Vol 70 (1) ◽  
pp. 3-6 ◽  
Author(s):  
P. F. Akufongwe ◽  
D. A. Dakul ◽  
P.D. Michael ◽  
P.D. Dajagat ◽  
W.L. Arabs
Keyword(s):  
Rural Communities ◽  
Local Government ◽  
Schistosoma Haematobium ◽  
Water Bodies ◽  
Prevalence Rates ◽  
Infection Rates ◽  
Snail Infection ◽  
Urinary Schistosomiasis ◽  
Plateau State ◽  
Transmission Foci

AbstractA preliminary parasitological and malacological survey was effected in rural communities of some Local Government Areas (LGA) in Plateau State, Nigeria, to estimate the prevalence of urinary schistosomiasis and identify active transmission foci. Out of 2888 persons examined in six LGAs, 1381 (47.82%) were excreting eggs of Schistosoma haematobium in their urine. Prevalence rates did not vary significantly (P > 0.05) between the LGAs: Pankshin (62.4%), Shendam (40.2%), Qua'an-Pan (22.9%), Langtang South (45.4%), Langtang North (58.8%) and Wase (50.0%). Infection rates were significantly different (P < 0.001) between the sexes. Many water bodies in the study communities were colonized by infected Bulinus snails. Snail infection rates varied significantly (P < 0.001) between the dry and wet seasons. A positive correlation was observed between snail infection rates and the prevalence of S. haematobium.

scholarly journals Characteristics Associated With Invasive Staphylococcus aureus Infection Rates in Nursing Homes, Emerging Infections Program

2020 ◽  
Vol 41 (S1) ◽  
pp. s60-s61
Author(s):  
Runa Gokhale ◽  
Kelly Jackson ◽  
Kelly Hatfield ◽  
Susan Petit ◽  
Susan Ray ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Nursing Homes ◽  
Influenza Vaccination ◽  
Incidence Rates ◽  
Resistant Organism ◽  
Short Stay ◽  
Emerging Infections ◽  
Infection Rates ◽  
Targeted Interventions ◽  
Surveillance Area

Background: Most invasive methicillin-resistant Staphylococcus aureus (iMRSA) infections have onset in the community but are associated with healthcare exposures. More than 25% of cases with healthcare exposure occur in nursing homes (NHs) where facility-specific iMRSA rates vary widely. We assessed associations between nursing home characteristics and iMRSA incidence rates to help target prevention efforts in NHs. Methods: We used active, laboratory- and population-based surveillance data collected through the Emerging Infections Program during 2011–2015 from 25 counties in 7 states. NH-onset cases were defined as isolation of MRSA from a normally sterile site in a surveillance area resident who was in a NH within 3 days before the index culture. We calculated MRSA incidence (cases per NH resident day) using Centers for Medicare & Medicaid Services (CMS) skilled nursing facility cost reports and described variation in iMRSA incidence by NH. We used Poisson regression with backward selection, assessing variables for collinearity, to estimate adjusted rate ratios (aRRs) for NH characteristics (obtained from the CMS minimum dataset) associated with iMRSA rates. Results: Of 590 surveillance area NHs included in analysis, 89 (15%) had no NH-onset iMRSA infections. Rates ranged from 0 to 23.4 infections per 100,000 resident days. Increased rate of NH-onset iMRSA infection occurred with increased percentage of residents in short stay ≤30 days (aRR, 1.09), exhibiting wounds or infection (surgical wound [aRR, 1.08]; vascular ulcer/foot infection [aRR, 1.09]; multidrug-resistant organism infection [aRR, 1.13]; receipt of antibiotics [aRR, 1.06]), using medical devices or invasive support (ostomy [aRR, 1.07]; dialysis [aRR, 1.07]; ventilator support [aRR, 1.17]), carrying neurologic diagnoses (cerebral palsy [aRR, 1.14]; brain injury [aRR, 1.1]), and demonstrating debility (requiring considerable assistance with bed mobility [aRR, 1.05]) (Table). iMRSA rates decreased with increased percentage of residents receiving influenza vaccination (aRR, 0.96) and with the presence of any patients in isolation for any active infection (aRR, 0.83). Conclusions: iMRSA incidence varies greatly across nursing homes, with many NH patient and facility characteristics associated with NH-onset iMRSA rate differences. Some associations (short stay, wounds and infection, medical device use and invasive support) suggest that targeted interventions utilizing known strategies to decrease transmission may help to reduce infection rates, while others (neurologic diagnoses, influenza vaccination, presence of patients in isolation) require further exploration to determine their role. These findings can help identify NHs in other areas more likely to have higher rates of NH-onset iMRSA who could benefit from interventions to reduce infection rates.Funding: NoneDisclosures: None

scholarly journals Comparison ofStaphylococcus aureuscarriage and skin infection rates in hospital and office employees

1979 ◽  
Vol 83 (3) ◽  
pp. 437-444 ◽  
Author(s):  
Claes Henning ◽  
Ulla Hillborgh ◽  
Kerstin Lindvall ◽  
Ole Marqvardsen ◽  
John Sellers ◽  
...  
Keyword(s):  
Skin Infection ◽  
Incidence Rates ◽  
Staphylococcal Infection ◽  
Individual Characteristics ◽  
Wound Infections ◽  
Hospital Personnel ◽  
Infection Rates ◽  
Office Staff ◽  
Superficial Wound ◽  
Office Employees

The incidence ofStaphylococcus aureusin the nose, throat and superficial wound infections of 99 office staff, 129 psychiatry staff and 115 surgical staff was studied over a 4-week period with the purpose of assessing the potential risk to hospital personnel of staphylococcal infection. Incidence rates, both average and cumulative, were essentially similar in the three groups but certain differences in the ecology of the staphylococcal phage groups were observed. Surgical staff appeared to have a more labile pattern of carriage. As in other Scandinavian studies throat carriage rates were high. Staphylococcal carriage seems largely to depend on individual characteristics rather than environmental factors.

Distribution of schistosome genetic diversity within naturally infected Rattus rattus detected by RAPD markers

Parasitology ◽  
1996 ◽  
Vol 113 (6) ◽  
pp. 511-517 ◽  
Author(s):  
V. Barral ◽  
S. Morand ◽  
J. P. Pointier ◽  
A. Théron
Keyword(s):  
Genetic Diversity ◽  
Rapd Markers ◽  
Random Amplified Polymorphic Dna ◽  
Rattus Rattus ◽  
High Mobility ◽  
Genotypic Diversity ◽  
Vertebrate Host ◽  
Infection Rates ◽  
Snail Infection ◽  
Vertebrate Hosts

SUMMARYRandom amplified polymorphic DNA markers (RAPD) were used to visualize the genetic diversity within and between infrapopulations of Schistosoma mansoni recovered from the natural vertebrate host, Rattus rattus, trapped at an insular Guadeloupean focus. Phenotypes were characterized by the sex of the parasites and by 8 polymorphic markers generated by 3 primers. Among the 212 parasite individuals recovered from 10 infected rats, 78 genotypes were characterized. All the hosts naturally infected harboured multiple parasite genotypes with a maximum diversity of 28 genotypes/host. Phenotypic and genotypic diversity calculated by Shannon-Wiener's indices and Lynch and Milligan's estimators respectively is, on average, greater within than between hosts. Considering the very low snail infection rates observed in this focus and the rapid turnover of the vertebrate hosts, our results suggest that the high mobility of the vertebrate host and/or plurimiracidial snail infections could be factors responsible for parasite genetic diversity within hosts.

Prevalence and Associated Factors of Urinary Schistosomiasis among Basic School Children in the Akyemansa District, Ghana

2019 ◽  
pp. 1-10
Author(s):  
Albert Abaka-Yawson ◽  
Christian Hotorvi ◽  
Enos Amoako Oduro ◽  
Philip Apraku Tawiah ◽  
Solomon Sosu Quarshie ◽  
...  
Keyword(s):  
Risk Factors ◽  
School Children ◽  
Schistosoma Haematobium ◽  
Intervention Strategy ◽  
Cross Sectional Study ◽  
Cross Sectional ◽  
Urinary Schistosomiasis ◽  
Multi Stage ◽  
Basic School ◽  
Associated Risk Factors

Background: Globally, urinary schistosomiasis has devastating implications on school children. It predisposes them to dysuria, haematuria among others which can negatively influence their academic performance. This study determined the prevalence and associated risk factors of urinary schistosomiasis among basic school children in the Akyemansa district.  Materials and Methods: A cross-sectional study design using multi-stage sampling was used to enroll 504 basic school children from six communities of the Akyemansa District into study. Structured questionnaires were used to gather information on risk factors. Urine samples were collected and microscopically examined for the presence of Schistosoma haematobium (SH) ova. The observed ova were then quantified as light or heavy. Results: Prevalence of SH infection among school children in Akyemansa District was 10.32% [95% CI: 7.80 -13.31%]. Out of 52 participants who were infected, 69.2% had light infection whilst the rest had heavy infection. Female participants were less likely to be infected with SH than males [OR=0.47; 95% CI: 0.23-0.97], children who do not stay by the river/stream were also less likely to be infected with SH compared to those who lived near waterbodies [OR=0.35; 95% CI: 0.17-0.72]. Additionally, participants who did not play around water bodies were also less likely to be infected with SH compared to those who did [OR=0.17; 95% CI= 0.04-0.71; p=0.015]. However, inhabitants of Kotokuom were more likely to be infected compared to those in Pawuda [OR=8.54; 95% CI: 1.91-38.27; p=0.005] Conclusion: The prevalence of urinary schistosomiasis among basic school children in the Akyemansa district was found to be 10.32% [95% CI: 7.80 -13.31%]. Gender, staying around river/ stream, playing at river/ stream and habitation of participants were significantly associated with the prevalence of Schistosoma haematobium infection. The study therefore recommends that periodic drug administration and a comprehensive intervention strategy should be designed and implemented to reduce schistosomiasis prevalence.

Trends in annual incidence of methicillin-resistant Staphylococcus aureus (MRSA) infection in HIV-infected and HIV-uninfected patients

2013 ◽  
Vol 141 (11) ◽  
pp. 2392-2402 ◽  
Author(s):  
G. N. DELORENZE ◽  
M. A. HORBERG ◽  
M. J. SILVERBERG ◽  
A. TSAI ◽  
C. P. QUESENBERRY ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Health Plan ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Incidence Rates ◽  
Infected Group ◽  
Rapid Rise ◽  
Infection Rates ◽  
Methicillin Resistant ◽  
Mrsa Infection

SUMMARYWe describe trends in incidence rates of methicillin-resistant Staphylococcus aureus (MRSA) in HIV-infected and HIV-uninfected patients enrolled in a large northern California Health Plan, and the ratio of MRSA to methicillin-susceptible S. aureus (MSSA) case counts. Between 1995 and 2010, 1549 MRSA infections were diagnosed in 14060 HIV-infected patients (11·0%) compared to 89546 MRSA infections in 6597396 HIV-uninfected patients (1·4%) (P = 0·00). A steady rise in MRSA infection rates began in 1995 in HIV-uninfected patients, peaking at 396·5 infections/100000 person-years in 2007. A more rapid rise in MRSA infection rates occurred in the HIV-infected group after 2000, peaking at 3592·8 infections/100000 in 2005. A declining trend in MRSA rates may have begun in 2008–2009. Comparing the ratio of MRSA to MSSA case counts, we observed that HIV-infected patients shouldered a greater burden of MRSA infection during most years of study follow-up compared to HIV-uninfected patients.

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