Epidemiologic and Virologic Characteristics of Influenza in Lao PDR, 2016-2023.

Autor: Wodniak N; Thailand Ministry of Public Health-U.S. Centers for Disease Control and Prevention Collaboration, Nonthaburi, Thailand., Vilivong K; National Center for Laboratory and Epidemiology, Vientiane, Lao People's Democratic Republic., Khamphaphongphane B; National Center for Laboratory and Epidemiology, Vientiane, Lao People's Democratic Republic., Sengkeopraseuth B; National Center for Laboratory and Epidemiology, Vientiane, Lao People's Democratic Republic., Somoulay V; National Center for Laboratory and Epidemiology, Vientiane, Lao People's Democratic Republic., Chiew M; WHO Health Emergencies Programme, World Health Organization, Vientiane, Lao People's Democratic Republic., Ketmayoon P; WHO Health Emergencies Programme, World Health Organization, Vientiane, Lao People's Democratic Republic., Jiao M; WHO Health Emergencies Programme, World Health Organization, Vientiane, Lao People's Democratic Republic., Phimmasine S; WHO Health Emergencies Programme, World Health Organization, Vientiane, Lao People's Democratic Republic., Co KC; WHO Health Emergencies Programme, World Health Organization, Vientiane, Lao People's Democratic Republic., Leuangvilay P; WHO Health Emergencies Programme, World Health Organization, Vientiane, Lao People's Democratic Republic., Otsu S; WHO Health Emergencies Programme, World Health Organization, Vientiane, Lao People's Democratic Republic., Khanthamaly V; U.S. Centers for Disease Control and Prevention Collaboration-Laos, Vientiane, Lao People's Democratic Republic.; Influenza Division, National Center for Immunization and Respiratory Diseases, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia, USA., Keopaseuth P; Ministry of Health, Vientiane, Lao People's Democratic Republic., Davis WW; Thailand Ministry of Public Health-U.S. Centers for Disease Control and Prevention Collaboration, Nonthaburi, Thailand.; Influenza Division, National Center for Immunization and Respiratory Diseases, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia, USA., Montgomery MP; Thailand Ministry of Public Health-U.S. Centers for Disease Control and Prevention Collaboration, Nonthaburi, Thailand.; Influenza Division, National Center for Immunization and Respiratory Diseases, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia, USA., Xangsayyarath P; National Center for Laboratory and Epidemiology, Vientiane, Lao People's Democratic Republic.
Jazyk: angličtina
Zdroj: Influenza and other respiratory viruses [Influenza Other Respir Viruses] 2024 Aug; Vol. 18 (8), pp. e13353.
DOI: 10.1111/irv.13353
Abstrakt: Background: Influenza sentinel surveillance in Lao PDR is used to inform seasonal vaccination programs. This analysis reviews epidemiologic and virologic characteristics of influenza virus infection over 8 years, before and after emergence of SARS-CoV-2.
Methods: Data collected for ILI and SARI surveillance during January 2016 through December 2023 were analyzed from nine hospitals. Respiratory specimens from ILI and SARI cases were tested by reverse transcriptase polymerase chain reaction to determine influenza positivity and subtype and lineage. Aggregate counts of outpatient visits and hospitalizations were collected from hospital logbooks. Epidemiologic trends of influenza activity were described, and the proportional contribution of influenza-associated ILI and SARI to outpatient and inpatient loads was estimated.
Results: Influenza was detected year-round with positivity peaking during September through January and occurring in most years approximately 1 month earlier in the south than the north. After decreasing in 2 years following the emergence of SARS-CoV-2, influenza positivity increased in 2022 and resumed its typical temporal trend. Influenza-associated ILI contribution to outpatient visits was highest among children ages 5-14 years (3.0% of all outpatient visits in 2023), and influenza-associated SARI contribution to inpatient hospitalizations was highest among children ages 2-4 years (2.2% of all hospitalizations in 2023).
Conclusions: Influenza surveillance in Lao PDR provides clinicians and public health authorities with information on geographic and temporal patterns of influenza transmission. Influenza surveillance data support current vaccination timing and recommendations to vaccinate certain populations, especially young children.
(© 2024 World Health Organization; licensed by John Wiley & Sons Ltd and The Author(s). Influenza and Other Respiratory Viruses published by John Wiley & Sons Ltd. This article has been contributed to by U.S. Government employees and their work is in the public domain in the USA.)
Databáze: MEDLINE
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