Abstract: Estimating Transmission Dynamics of African Swine Fever Virus from Experimental Studies

Jan 09, 2023

Abstract: Estimating transmission dynamics of African swine fever virus from experimental studies

African swine fever virus (ASFV) continues to spread across the world, and currently, there are no treatments or vaccines available to combat this virus. Reliable estimates of transmission parameters for ASFV are therefore needed to establish effective contingency plans. This study used data from controlled ASFV inoculations of pigs to assess the transmission parameters. Three models were developed with (binary, piecewise-linear and exponential) time-dependent levels of infectiousness based on latency periods of 3-5 days derived from the analysis of 294 ethylenediamine tetraacetic acid-stabilized blood samples originating from 16 pigs with direct and 10 pigs with indirect contact to 8 inoculated pigs. The models were evaluated for three different discrete latency periods of infection. The likelihood ratio test showed that a binary model had an equally good fit for a latency period of 4 or 5 days as the piecewise-linear and exponential model. However, for a latency period of 3 days, the piecewise-linear and exponential models had the best fit.

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Video: Sorting Ewes & Rams | Breeding Time On The Farm!

In this episode, we’re sorting ewes into their breeding groups and introducing them to unrelated rams. Moving rams between barns always comes with challenges, but once the boys meet their ewes, everyone was eager to settle in!

We also welcome back a returning customer who purchased a Suffolk ram from us last year. This season, she chose a Dorset cross ram, now named Benny, to strengthen her flock’s genetics. It’s always rewarding to see repeat customers who value the quality of our breeding stock.

Arnie then tours the crop fields as harvest season approaches. Despite drought conditions this summer, the crops are looking surprisingly good. We close the day with evening feedings and one last look at the rams with their new breeding groups.

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