Some features of African swine fever through investigation on disease progression in the field outbreaks

Abstract

The objective of this study aimed at initially investigating the presence of African swine fever virus
(ASFV) and some characteristics of the disease in the field outbreaks in some southern provinces.
The studied result showed that the rate of 50% cumulative morbidity in the pig population in the sow
farm.1 - open system (common feeding trough) was at the day 4th, meanwhile in the sow farm. 2
- close-system (individual feeding trough) was at the day 16th after appearing the outbreak. In the
pig farms for pork, the rate of 50% cumulative morbidity was at the day 15th to the day 18th after
appearing the outbreak. The rate of epidemic transmission was different among the farm types and
the age groups of pigs, but the common point was that the time of appearing the number of the
infected pigs in the first week of the outbreaks was rather slow, after that the number of the infected
pigs was increased rapidly in the second and third weeks. The clinical signs of the disease in sows
and fattening pigs were loss appetite, depression (100%); followed by hemorrhage and cyanosis in
the fattening pigs (93.42%) but these signs in the sows were significantly lower (3.17%) (P<0.05).
Vomiting occurred with the low rate (0% in the finisher pigs, 11.90% in the sows). 82.54% of the sows
were died just after appearing the common clinical signs (stop eating and depression). The rate of
appearing gross lesions in visceral organs were similar between the sows and the finisher pigs.