3.1. PCR- based detection of PCV4
Among 335 samples, 11 (3.28%) were positive using PCV4F and PCV4R.
Though the detection rates seemed quite low, two notices were obvious.
It was the wide distribution of PCV4 in six out of nine sampling sites
(Figures 1A- 1B). And the virus appeared to be present in all age groups
and aborted fetuses (Figure 1C). There were no PCV4 positive samples in
the finisher group, which was highly likely due to small sample size.
Noteworthy, PCV4 was both found in clinically healthy (testicles of
piglets) and clinical sick pigs (pooled internal organs).