3.4 SFTSV and Rickettsia nucleic acid detection and virus
isolation results
From the 5 confirmed cases of
SFTSV, 2 SFTSV strains were
successfully isolated and named LNHDD2019-9 (from Dandong City, Liaoning
Province) and LNHDG2019-6 (from Donggang City, Liaoning Province). NoRickettsia nucleic acid was detected in the serum or blood cells
of the 17 patients suspected of SFTSV.
A total of 492 tick samples were
collected from the patient’s residence and surrounding areas (including
Dandong City and, under its jurisdiction, Fengcheng City, Donggang City;
Kuandian Manchu Autonomous County; and Zhuanghe City under the
jurisdiciton of Dalian,which are all Changbai Mountain forest areas in
the border area between China and North Korea).
Environmental
free tick samples (samples not collected in Beipiao City) were all
identified by molecular biology. Among them, 12 samples were positive
for SFTSV nucleic acids, with a positivity rate of 2.4%. Two SFTSV
strains were successfully isolated from tick samples and were named
LNTEDG2019-6 (collected from Erdaogou, Dandong City, Liaoning Province)
and LNTYJ2019-6 (collected from Yanji City, Jilin Province) (Figure 1).