scholarly journals Moderate Vaccine Effectiveness against Severe Acute Respiratory Infection Caused by A(H1N1)pdm09 Influenza Virus and No Effectiveness against A(H3N2) Influenza Virus in the 2018/2019 Season in Italy

Vaccines ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 427 ◽  
Author(s):  
Caterina Rizzo ◽  
Francesco Gesualdo ◽  
Daniela Loconsole ◽  
Elisabetta Pandolfi ◽  
Antonino Bella ◽  
...  
Keyword(s):  
Influenza Virus ◽  
Respiratory Infection ◽  
Acute Respiratory Infection ◽  
Vaccine Coverage ◽  
Type A ◽  
Vaccine Effectiveness ◽  
Influenza Viruses ◽  
Severe Acute Respiratory Infection ◽  
H3n2 Influenza ◽  
Subtype A

Every season, circulating influenza viruses change; therefore, vaccines must be reformulated each year. We aimed to estimate vaccine effectiveness (VE) against severe influenza infection for the 2018/19 season in Italy. We conducted a test-negative design case-control study at five Italian hospitals. We estimated influenza VE against severe acute respiratory infection (SARI) requiring hospitalisation overall, and by virus subtype, vaccine brand, and age. The 2018/19 season was characterised by A(H1N1)pmd09 and A(H3N2) influenza viruses. Vaccine coverage among <18 years recruited SARI cases was very low (3.2%). Seasonal vaccines were moderately effective against type A influenza overall (adjusted VE = 40.5%; 95% confidence interval (CI) = 18.7–56.4%) and subtype A(H1N1)pmd09 viruses (adjusted VE = 55%; 95% CI = 34.5–69.1%), but ineffective against subtype A(H3N2) viruses (adjusted VE = 2.5%; 95% CI = −50.0–36.7%). Both Fluad and Fluarix Tetra vaccines were effective against type A influenza overall and subtype A(H1N1)pdm09 viruses. VE appeared to be similar across age groups (0–64 years, ≥65 years). Seasonal influenza vaccines in the 2018/19 season were moderately effective in preventing SARI caused by A(H1N1)pdm09 influenza but ineffective against A(H3N2).

scholarly journals SARS-CoV-2 and influenza virus coinfection among patients with severe acute respiratory infection during the first wave of COVID-19 pandemic in Bangladesh: a hospital-based descriptive study

BMJ Open ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. e053768
Author(s):  
Zubair Akhtar ◽  
Md Ariful Islam ◽  
Mohammad Abdul Aleem ◽  
Syeda Mah-E-Muneer ◽  
M Kaousar Ahmmed ◽  
...  
Keyword(s):  
Influenza Virus ◽  
Hospital Mortality ◽  
Respiratory Infection ◽  
Acute Respiratory Infection ◽  
Descriptive Study ◽  
Tertiary Level ◽  
Future Studies ◽  
Severe Acute Respiratory Infection ◽  
Hospital Deaths ◽  
Secondary Outcomes

ObjectiveTo estimate the proportion of SARS-CoV-2 and influenza virus coinfection among severe acute respiratory infection (SARI) cases-patients during the first wave of COVID-19 pandemic in Bangladesh.DesignDescriptive study.SettingNine tertiary level hospitals across Bangladesh.ParticipantsPatients admitted as SARI (defined as cases with subjective or measured fever of ≥38 C° and cough with onset within the last 10 days and requiring hospital admission) case-patients.Primary and secondary outcomesProportion of SARS-CoV-2 and influenza virus coinfection and proportion of mortality among SARI case-patients.ResultsWe enrolled 1986 SARI case-patients with a median age: 28 years (IQR: 1.2–53 years), and 67.6% were male. Among them, 285 (14.3%) were infected with SARS-CoV-2; 175 (8.8%) were infected with the influenza virus, and five (0.3%) were coinfected with both viruses. There was a non-appearance of influenza during the usual peak season (May to July) in Bangladesh. SARS-CoV-2 infection was significantly more associated with diabetes (14.0% vs 5.9%, p<0.001) and hypertension (26.7% vs 11.5%, p<0.001). But influenza among SARI case-patients was significantly less associated with diabetes (4.0% vs 7.4%, p=0.047) and hypertension (5.7% vs 14.4%, p=0.001). The proportion of in-hospital deaths among SARS-CoV-2 infected SARI case-patients were higher (10.9% (n=31) vs 4.4% (n=75), p<0.001) than those without SARS-CoV-2 infection; the proportion of postdischarge deaths within 30 days was also higher (9.1% (n=25) vs 4.6% (n=74), p=0.001) among SARS-CoV-2 infected SARI case-patients than those without infection. No in-hospital mortality or postdischarge mortality was registered among the five coinfected SARI case-patients.ConclusionsOur findings suggest that coinfection with SARS-CoV-2 and influenza virus was not very common and had less disease severity considering mortality in Bangladesh. There was no circulating influenza virus during the influenza peak season during the COVID-19 pandemic in 2020. Future studies are warranted for further exploration.

scholarly journals Respiratory syncytial and influenza viruses in children under 2 years old with severe acute respiratory infection (SARI) in Maputo, 2015

PLoS ONE ◽  
2017 ◽  
Vol 12 (11) ◽  
pp. e0186735 ◽  
Author(s):  
Mirela Pale ◽  
Afonso Nacoto ◽  
Almiro Tivane ◽  
Neuza Nguenha ◽  
Loira Machalele ◽  
...  
Keyword(s):  
Respiratory Infection ◽  
Acute Respiratory Infection ◽  
Influenza Viruses ◽  
Severe Acute Respiratory Infection

scholarly journals Etiological and epidemiological characteristics of severe acute respiratory infection caused by multiple viruses and Mycoplasma pneumoniae in adult patients in Jinshan, Shanghai: A pilot hospital-based surveillance study

PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0248750 ◽  
Author(s):  
Jian Li ◽  
Can-Lei Song ◽  
Tang Wang ◽  
Yu-Long Ye ◽  
Jian-Ru Du ◽  
...  
Keyword(s):  
Influenza Virus ◽  
Mycoplasma Pneumoniae ◽  
Active Surveillance ◽  
Respiratory Infection ◽  
Acute Respiratory Infection ◽  
Adult Patients ◽  
Chronic Medical Condition ◽  
Human Bocavirus ◽  
Influenza Virus A ◽  
Severe Acute Respiratory Infection

Background Severe acute respiratory infection (SARI) results in a tremendous disease burden worldwide. Available research on active surveillance among hospitalized adult patients suffering from SARI in China is limited. This pilot study aimed to identify associated etiologies and describe the demographic, epidemiological and clinical profiles of hospitalized SARI patients aged over 16 years in Jinshan, Shanghai. Methods Active surveillance was conducted at 1 sentinel hospital in Jinshan district, Shanghai, from April 2017 to March 2018. Hospitalized SARI patients aged over 16 years old were enrolled, and nasopharyngeal swabs were collected within 24 hours of admission and tested for multiple respiratory viruses (including 18 common viruses) and Mycoplasma pneumoniae with real-time polymerase chain reaction. Demographic, epidemiological and clinical information was obtained from case report forms. Results In total, 397 SARI patients were enrolled; the median age was 68 years, and 194 (48.9%) patients were male. A total of 278 (70.0%) patients had at least one underlying chronic medical condition. The most frequent symptoms were cough (99.2%) and sputum production (88.4%). The median duration of hospitalization was 10 days. A total of 250 infection patients (63.0%) were positive for at least one pathogen, of whom 198 (49.9%) were positive for a single pathogen and 52 (13.1%) were positive for multiple pathogens. The pathogens identified most frequently were M. pneumoniae (23.9%, 95/397), followed by adenovirus (AdV) (11.6%, 46/397), influenza virus A/H3N2 (Flu A/H3N2) (11.1%, 44/397), human rhinovirus (HRhV) (8.1%, 32/397), influenza virus B/Yamagata (Flu B/Yamagata) (6.3%, 25/397), pandemic influenza virus A/H1N1 (Flu A/pH1N1) (4.0%, 16/397), parainfluenza virus (PIV) type 1 (2.0%, 8/397), human coronavirus (HCoV) type NL63 (2.0%, 8/397), HCoV 229E (1.5%, 6/397), HCoV HKU1 (1.5%, 6/397), PIV 3 (1.5%, 6/397), human metapneumovirus (HMPV) (1.5%, 6/397), PIV 4 (1.3%, 5/397), HCoV OC43 (1.0%, 4/397), influenza virus B/Victoria (Flu B/Victoria) (0.5%, 2/397), respiratory syncytial virus (RSV) type B (0.5%, 2/397), and human bocavirus (HBoV) (0.3%, 1/397). The seasonality of pathogen-confirmed SARI patients had a bimodal distribution, with the first peak in the summer and the second peak in the winter. Statistically significant differences were observed with respect to the rates of dyspnea, radiographically diagnosed pneumonia and the presence of at least one comorbidity in patients who were infected with only M. pneumoniae, AdV, HRhV, Flu A/H3N2, Flu A /pH1N1 or Flu B/Yamagata. The differences in the positivity rates of the above 6 pathogens among the different age groups were nonsignificant. Conclusions M. pneumoniae, AdV and Flu A/H3N2 were the main pathogens detected in hospitalized SARI patients aged over 16 years old in Jinshan district, Shanghai. Our findings highlight the importance of sustained multipathogen surveillance among SARI patients in sentinel hospitals, which can provide useful information on SARI etiologies, epidemiology, and clinical characteristics.

scholarly journals Pathogenic Studies and Antigenic and Sequence Comparisons of A/Equine/Alaska/1/91 (H3NS) Influenza Virus

1993 ◽  
Vol 5 (1) ◽  
pp. 8-11 ◽  
Author(s):  
Arnold D. Alstad ◽  
Sudhir P. Sahu ◽  
Douglas D. Pedersen ◽  
Dennis A. Saari ◽  
Yoshihiro Kawaoka ◽  
...  
Keyword(s):  
Influenza Virus ◽  
Sequence Analysis ◽  
Respiratory Infection ◽  
Hemagglutination Inhibition ◽  
Acute Respiratory Infection ◽  
Influenza Viruses ◽  
Antigenic Drift ◽  
Gene Sequences ◽  
Sequence Comparisons ◽  
Influenza Virus A

An influenza virus, A/equine/Alaska/1/91 (H3N8), was isolated from horses from Alaska with an acute respiratory infection. Pathogenic and serologic studies revealed that this virus is similar to previously isolated equine H3N8 influenza viruses. Antigenic analyses utilizing hemagglutination inhibition and neuraminidase inhibition assays indicated an antigenic drift from the prototype equine H3N8 influenza virus, A/equine/Miami/1/63. Partial sequence analysis of the A/equine/Alaska influenza virus indicated that each of 8 gene sequences are of equine origin.

scholarly journals 1373Severe acute respiratory infection with high mortality rate in Sana'a city, 2018-2019 Yemen

2021 ◽  
Vol 50 (Supplement_1) ◽  
Author(s):  
Manal Mahsoon ◽  
Yasser Ghaleb ◽  
Riham Al-dubaiee ◽  
Mohamed Al Amad
Keyword(s):  
Respiratory Infection ◽  
Acute Respiratory Infection ◽  
Case Fatality Rate ◽  
Case Fatality ◽  
Control Program ◽  
Case Definition ◽  
Influenza Viruses ◽  
P Value ◽  
Fatality Rate ◽  
Severe Acute Respiratory Infection

Abstract Background The burden of influenza and severe acute respiratory infection (SARI) in conflict countries such as Yemen is exacerbated due to limited resources and the collapse of the health system. The aims are to describe epidemiology of SARI, determine influenza detection and case fatality rates among SARI patients. Methods We used a descriptive analytical study design. All SARI patients who meet WHO case definition during 2018-2019 from Sana'a city were included. Nasopharyngeal samples were examined by polymerase chain reaction. A soft copy of data that collected by surveillance staff was obtained from the National Influenza Control Program (NICP). Case fatality rate and detection rate were calculated and P value &lt; 0.05 used for statistical significant. Results 1447 SARI patients were reported: 73% males, 54% aged 15- &lt; 50 years. Comorbidity was among 27% (387) of them: (57% cardio-vascular diseases and 50% diabetes). Samples of 934 (64%) SARI patients were tested and influenza viruses were detected in 141 (15%) patients (13% type A and 2% type B). Higher influenza viruses were detected in winter months (November – February) (17% vs 9%, P &lt; 0.001). Overall SARI fatality rate was 19% (276), significantly higher among patients with comorbidity (26% vs 16%, P &lt; 0.001) confirmed influenza (30% Vs 15%, P value &lt; 0.001) and not receiving antiviral (51% vs 17%, P &lt; 0.001) than relevant groups. Conclusions SARI patients in Yemen had a high case-fatality rate particularly SARI patients with confirmed influenza. Introduce influenza vaccination for the risk group should be considered. Key messages Influenza and SARI cases are high in Yemen and progress to death.

scholarly journals Aetiology of acute respiratory infection in preschool children requiring hospitalisation in Europe—results from the PED-MERMAIDS multicentre case–control study

2021 ◽  
Vol 8 (1) ◽  
pp. e000887
Author(s):  
Malte Kohns Vasconcelos ◽  
Katherine Loens ◽  
Louise Sigfrid ◽  
Elias Iosifidis ◽  
Cristina Epalza ◽  
...  
Keyword(s):  
Influenza Virus ◽  
Respiratory Infection ◽  
Acute Respiratory Infection ◽  
Pathogenic Bacteria ◽  
Population Attributable Fraction ◽  
Case Definition ◽  
Influenza Viruses ◽  
Respiratory Pathogens ◽  
Case Status ◽  
Syncytial Virus

BackgroundBoth pathogenic bacteria and viruses are frequently detected in the nasopharynx (NP) of children in the absence of acute respiratory infection (ARI) symptoms. The aim of this study was to estimate the aetiological fractions for ARI hospitalisation in children for respiratory syncytial virus (RSV) and influenza virus and to determine whether detection of specific respiratory pathogens on NP samples was associated with ARI hospitalisation.Methods349 children up to 5 years of age hospitalised for ARI (following a symptom-based case definition) and 306 hospital controls were prospectively enrolled in 16 centres across seven European Union countries between 2016 and 2019. Admission day NP swabs were analysed by multiplex PCR for 25 targets.ResultsRSV was the leading single cause of ARI hospitalisations, with an overall population attributable fraction (PAF) of 33.4% and high seasonality as well as preponderance in younger children. Detection of RSV on NP swabs was strongly associated with ARI hospitalisation (OR adjusted for age and season: 20.6, 95% CI: 9.4 to 45.3). Detection of three other viral pathogens showed strong associations with ARI hospitalisation: influenza viruses had an adjusted OR of 6.1 (95% CI: 2.5 to 14.9), parainfluenza viruses (PIVs) an adjusted OR of 4.6 (95% CI: 1.8 to 11.3) and metapneumoviruses an adjusted OR of 4.5 (95% CI: 1.3 to 16.1). Influenza viruses had a PAF of 7.9%, PIVs of 6.5% and metapneumoviruses of 3.0%. In contrast, most other pathogens were found in similar proportions in cases and controls, including Streptococcus pneumoniae, which was weakly associated with case status, and endemic coronaviruses.ConclusionRSV is the predominant cause of ARI hospitalisations in young children in Europe and its detection, as well as detection of influenza virus, PIV or metapneumovirus, on NP swabs can establish aetiology with high probability. PAFs for RSV and influenza virus are highly seasonal and age dependent.

Sign in / Sign up

Export Citation Format

Share Document