A Beijing-based vet was confirmed as China's first human infection case with Monkey B Virus (BV) and died from the virus; but his close contacts are safe from it for now.

The 53-year-old male vet, who works for an institution researching on non-human primates, showed early-onset symptoms of nausea and vomiting, a month after he dissected two dead monkeys in early March, China CDC Weekly English Platform of Chinese Center for Disease Control and Prevention revealed on Saturday.

The vet sought treatment in several hospitals, and eventually died on May 27, said the journal. It said that there were no fatal or even clinically evident BV infections in China before, thus the vet's case marks the first human infection case with BV identified in China.

Researchers have collected the cerebrospinal fluid of the veterinarian in April and identified him as positive for BV, yet samples of his close contacts suggested negative results for the virus.

The virus, initially isolated in 1932, is an alphaherpesvirus enzootic in macaques of the genus Macaca. It can be transmitted via direct contact and exchange of bodily secretions; and has a fatality rate of 70 percent to 80 percent.

The journal suggested that BV in monkeys might pose a potential threat to occupational workers. It is necessary to eliminate BV during the development of specific pathogen-free rhesus colonies and to strengthen surveillance in laboratory macaques and occupational workers in China.