As of Sunday, the WHO had been informed of 34 laboratory-confirmed cases of human infection with nCoV worldwide since last September, including 18 deaths, it said.
The deaths were among the 16 confirmedcases of human infection in the nation, mostly on the eastern coast near the Shanghai, the nation's biggest city and financial hub.
In the first nine months of 1999, before the immunisation campaign started, there were 551 confirmedcases of group C meningococcal infection and 47 deaths.
Mexican authorities also suspect that 159 deaths have resulted from the infection, although only a small number of cases -- less than a dozen -- have been confirmed.