Of the pigs that did not develop clinical<br>signs following aerosol exposure to FMDV, a few showed a lowlevel, transient sero-conversion to FMDV between days 10 and<br>14 after exposure, suggesting an ‘incubation period’ of up to <br>9 days. For the purpose of calculating when virus first entered<br>a premise, a maximum incubation period of 14 days is<br>generally added to the age of the oldest lesions found. However,<br>in pigs a maximum incubation period of 11 days should be<br>considered for such estimations.<br>Infected pigs initially show mild signs of lameness, blanching of<br>the skin around the coronary bands and may develop a fever of<br>up to 42°C but most often, this is in the range of 39°C to 40°C.<br>Temperature increase in FMD-infected pigs may sometimes be<br>inconsistent, short-lived or close to the normal variation seen<br>and severely affected pigs may even have a drop in temperature<br>to below the normal range. Consequently, body temperature in<br>pigs should be used to support other clinical findings and<br>cannot be used to exclude the possibility of infection. Local<br>signs of inflammation such as heat and/or pain when touching<br>and applying finger pressure on areas of the feet may often be<br>detected by careful clinical examination before any increase in<br>body temperature is apparent. Affected pigs become lethargic<br>and remain huddled together and take reduced or little interest<br>trong thực phẩm. Túi phát triển trên băng tần vành và gót chân của <br>bàn chân (bao gồm các chữ số phụ kiện), trên mõm, hàm dưới <br>và lưỡi (Hình. 1).
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