The results of a gene sequencing test show the coronavirus found
in the suspected severe acute respiratory syndrome (SARS) case in
Guangzhou is a virus variation with new sequence, according to the
Center for Disease Prevention and Control in southern China's
Guangdong Province Friday evening.
That's to say, it is possible that the man with the suspected
case of SARS in the province have contracted SARS, according to the
center.
The center had carried out a series of tests on the case. Using
the method of reverse transcription-polymerase chain reaction
(RT-PCR), scientists obtained S, M and N genes of coronavirus from
the suspect.
Comparing the sequences of the gene section with all those of
the SARS coronavirus published by the international gene bank,
experts found that 98.8 to 99.4 percent of 3,768 bases of S gene
obtained from the suspect, 99 percent of 658 bases of M gene, and
99 percent of 1,068 bases of N gene, are isogenous with those of
S,M and N genes published by the gene bank.
"The results point to the possibility of the suspect infected by
SARS coronavirus, but our sequence test shows that the S gene is a
new sequence that has not been published," said Dr. Chen Qiuxia
with the center.
Prof. Zhong Nanshan, an academician of the Chinese Academy of
Engineering, also said the test result showed a possibility that
the SARS coronavirus has a variation.
Both Chinese experts and World Health Organization experts have
adopted a prudent approach to the final diagnosis of the case while
generally agreeing to the results of the tests, Zhong
said.?????
"But the wait will continue in the final diagnosis of the
suspected SARS case because the infection channel and infectivity
remained unknown," he added.
The 32-year-old freelance TV station worker is the first
suspected SARS case in Guangdong since May 23, 2003, when the World
Health Organization lifted the SARS-related travel advisory against
the province.
(Xinhua News Agency January 3, 2004)