tetano
Editor, Senior Moderator
Influenza Other Respir Viruses. 2016 Jan 18. doi: 10.1111/irv.12372. [Epub ahead of print]
[h=1]Divergent Seasonal Patterns of Influenza Types A and B across Latitude Gradient in Tropical Asia.[/h] Saha S[SUP]1[/SUP], Chadha M[SUP]2[/SUP], Shu Y[SUP]3[/SUP], Lijie W[SUP]3[/SUP], Chittaganpitch M[SUP]4[/SUP], Waicharoen S[SUP]4[/SUP], Lindblade KA[SUP]5[/SUP], Phengta V[SUP]6[/SUP], Phonekeo D[SUP]6[/SUP], Corwin A[SUP]5[/SUP], Touch S[SUP]7[/SUP], Buchy P[SUP]8[/SUP], Lin R[SUP]9[/SUP], Low C[SUP]9[/SUP], Kheong CC[SUP]10[/SUP], Yusof AB[SUP]11[/SUP], Tandoc A 3rd[SUP]12[/SUP], Roque V Jr[SUP]13[/SUP], Arguelles V[SUP]13[/SUP], Dawood FS[SUP]5[/SUP], Moen A[SUP]5[/SUP], Widdowson MA[SUP]5[/SUP], Cox NJ[SUP]5[/SUP], Lal RB[SUP]1[/SUP].
[h=3]Author information[/h]
[h=3]Abstract[/h] [h=4]METHODS:[/h] We analyzed influenza surveillance data from nine countries around southern and southeastern Asia spanning latitudinal gradient from equatorial to temperate zones to further characterize influenza type specific seasonality in the region. We calculated proportion of positives by month out of positives during that year and adjust for variation in samples tested and positivity in these countries.
[h=4]RESULTS:[/h] Influenza A epidemics were identified between November-March during winters in areas lying above 30[SUP]o[/SUP] N latitude; during monsoon months of June-November in areas between 10[SUP]o[/SUP] -30[SUP]o[/SUP] N latitude, and no specific seasonality for influenza A virus circulation in areas lying closer to the equator. Influenza B circulation coincided with influenza A circulation in areas lying above 30[SUP]o[/SUP] N latitude; however in areas south of 30[SUP]o[/SUP] N Asia, influenza B circulated year round at 3-8% of annual influenza B positives during most months with less pronounced peaks during post-monsoon period.
[h=4]CONCLUSION:[/h] Even though influenza B circulates round the year in most areas of the tropical southern and southeastern Asia region, the most appropriate time for influenza vaccination would be prior to the monsoon season conferring protection against influenza A and B peaks using the most recent WHO recommended vaccine. This article is protected by copyright. All rights reserved.
This article is protected by copyright. All rights reserved.
[h=4]KEYWORDS:[/h] Human Influenza; Influenza Surveillance; Influenza in Tropics; Influenza seasonality
PMID: 26781162 [PubMed - as supplied by publisher] Free full text
[h=1]Divergent Seasonal Patterns of Influenza Types A and B across Latitude Gradient in Tropical Asia.[/h] Saha S[SUP]1[/SUP], Chadha M[SUP]2[/SUP], Shu Y[SUP]3[/SUP], Lijie W[SUP]3[/SUP], Chittaganpitch M[SUP]4[/SUP], Waicharoen S[SUP]4[/SUP], Lindblade KA[SUP]5[/SUP], Phengta V[SUP]6[/SUP], Phonekeo D[SUP]6[/SUP], Corwin A[SUP]5[/SUP], Touch S[SUP]7[/SUP], Buchy P[SUP]8[/SUP], Lin R[SUP]9[/SUP], Low C[SUP]9[/SUP], Kheong CC[SUP]10[/SUP], Yusof AB[SUP]11[/SUP], Tandoc A 3rd[SUP]12[/SUP], Roque V Jr[SUP]13[/SUP], Arguelles V[SUP]13[/SUP], Dawood FS[SUP]5[/SUP], Moen A[SUP]5[/SUP], Widdowson MA[SUP]5[/SUP], Cox NJ[SUP]5[/SUP], Lal RB[SUP]1[/SUP].
[h=3]Author information[/h]
[h=3]Abstract[/h] [h=4]METHODS:[/h] We analyzed influenza surveillance data from nine countries around southern and southeastern Asia spanning latitudinal gradient from equatorial to temperate zones to further characterize influenza type specific seasonality in the region. We calculated proportion of positives by month out of positives during that year and adjust for variation in samples tested and positivity in these countries.
[h=4]RESULTS:[/h] Influenza A epidemics were identified between November-March during winters in areas lying above 30[SUP]o[/SUP] N latitude; during monsoon months of June-November in areas between 10[SUP]o[/SUP] -30[SUP]o[/SUP] N latitude, and no specific seasonality for influenza A virus circulation in areas lying closer to the equator. Influenza B circulation coincided with influenza A circulation in areas lying above 30[SUP]o[/SUP] N latitude; however in areas south of 30[SUP]o[/SUP] N Asia, influenza B circulated year round at 3-8% of annual influenza B positives during most months with less pronounced peaks during post-monsoon period.
[h=4]CONCLUSION:[/h] Even though influenza B circulates round the year in most areas of the tropical southern and southeastern Asia region, the most appropriate time for influenza vaccination would be prior to the monsoon season conferring protection against influenza A and B peaks using the most recent WHO recommended vaccine. This article is protected by copyright. All rights reserved.
This article is protected by copyright. All rights reserved.
[h=4]KEYWORDS:[/h] Human Influenza; Influenza Surveillance; Influenza in Tropics; Influenza seasonality
PMID: 26781162 [PubMed - as supplied by publisher] Free full text