Epidemiology and molecular characterization of avian influenza virus in backyard poultry of Chattogram, Bangladesh

Dutta, Pronesh; Islam, Ariful; Sayeed, Md. Abu; Rahman, Md. Ashiqur; Abdullah, Md. Sadeque; Saha, Otun; Rahman, Mohammed Ziaur; Klaassen, Marcel; Hoque, Md. Ahasanul; Hassan, Mohammad Mahmudul

doi:10.1016/j.meegid.2022.105377

“…At the flock level, H9N2 AIV prevalence around Chattogram has been estimated at around 0.7% and 1.9% for backyard and broiler chickens, respectively. Another cross-sectional study of household chickens performed in the same area found a household-level prevalence of H9N2 AIV of 3.2% 45 .…”

Section: Discussionmentioning

confidence: 89%

Modelling the transmission dynamics of H9N2 avian influenza viruses in a live bird market

Pinotti,

Kohnle,

Lourenço

et al. 2024

Nat Commun

Self Cite

1

0

View full text Add to dashboard Cite

H9N2 avian influenza viruses (AIVs) are a major concern for the poultry sector and human health in countries where this subtype is endemic. By fitting a model simulating H9N2 AIV transmission to data from a field experiment, we characterise the epidemiology of the virus in a live bird market in Bangladesh. Many supplied birds arrive already exposed to H9N2 AIVs, resulting in many broiler chickens entering the market as infected, and many indigenous backyard chickens entering with pre-existing immunity. Most susceptible chickens become infected within one day spent at the market, owing to high levels of viral transmission within market and short latent periods, as brief as 5.3 hours. Although H9N2 AIV transmission can be substantially reduced under moderate levels of cleaning and disinfection, effective risk mitigation also requires a range of additional interventions targeting markets and other nodes along the poultry production and distribution network.

show abstract

“…At the flock-level, H9N2 AIV prevalence around Chattogram has been estimated around 0.7% and 1.9% for backyard and broiler chickens, respectively. Another cross-sectional study of household chickens performed in the same area found a household-level prevalence of H9N2 AIV of 3.2% 43 .…”

Section: Discussionmentioning

confidence: 89%

Modelling the transmission dynamics of H9N2 avian influenza viruses in a live bird market

Pinotti,

Kohnle,

Lourenço

et al. 2023

Preprint

View full text Add to dashboard Cite

H9N2 avian influenza viruses (AIVs) are a major concern for the poultry sector and human health in countries where this subtype is endemic. By fitting a model simulating H9N2 AIV transmission to data from a field experiment, we characterise the epidemiology of the virus in a live bird market in Bangladesh. Many supplied birds arrive already exposed to H9N2 AIVs, resulting in many broiler chickens entering the market as infected, and many indigenous backyard chickens entering with pre-existing immunity. Most susceptible chickens become infected within one day spent at the market, owing to high levels of viral transmission within market and short latent periods, as brief as 5.3 hours. Although H9N2 AIV transmission can be substantially reduced under moderate levels of cleaning and disinfection, effective risk mitigation also requires a range of additional interventions targeting markets and other nodes along the poultry production and distribution network.

show abstract

“…23 The prevalence of AIVs in chickens present in farms and rural households (T0) was higher than previously described. 16,24 For broilers, all AIV-positive chickens originated from a single farm, whereas the particularly high proportion of positive backyard chickens (14.1%) may have resulted from selection bias. Refusal rate was high and the willingness of rural households to sell chickens may have been associated with ongoing or recent disease outbreaks in the village or their own flock.…”

Section: Discussionmentioning

confidence: 99%

Amplification of avian influenza viruses along poultry marketing chains in Bangladesh: a controlled field experiment

Kohnle,

Das,

Uddin

et al. 2023

Preprint

Self Cite

View full text Add to dashboard Cite

The prevalence of avian influenza viruses (AIVs) is commonly found to increase dramatically from farms to live bird markets (LBMs). Viral transmission dynamics along marketing chains is, however, poorly understood. To address this gap, we implemented a field experiment altering chicken supply to an LBM in Chattogram, Bangladesh. Chickens traded along altered (intervention) and conventional (control) marketing chains were tested for AIVs. Upon arrival at the LBM, the odds of detecting AIVs did not differ between control and intervention groups. However, 12 hours later, intervention group odds were lower, particularly for broiler chickens, indicating that viral shedding in LBM resulted partly from infections during transport and trade. Curtailing AIV prevalence in LBMs requires mitigating risk in marketing chain nodes preceding chickens’ delivery at LBMs.Article Summary LineThe high prevalence of avian influenza viruses in marketed chickens cannot be solely attributed to viral transmission within live bird markets but is also influenced by infections occurring prior to the chickens’ supply to these markets.

show abstract

Epidemiology and molecular characterization of avian influenza virus in backyard poultry of Chattogram, Bangladesh

Cited by 10 publications

References 64 publications

Modelling the transmission dynamics of H9N2 avian influenza viruses in a live bird market

Modelling the transmission dynamics of H9N2 avian influenza viruses in a live bird market

Modelling the transmission dynamics of H9N2 avian influenza viruses in a live bird market

Amplification of avian influenza viruses along poultry marketing chains in Bangladesh: a controlled field experiment

Contact Info

Product

Resources

About