January's fatalities were up to four times higher than the same month in past years, and brought the total H7N9 death toll to 100 people since October, data from the National Health and Family Planning Commission showed late on Tuesday.
Authorities have repeatedly warned the public to stay alert for the virus, and cautioned against panic in the world's second-largest economy.
But the latest bird flu data has sparked concerns of a repeat of previous health crises, like the 2002 outbreak of Severe Acute Respiratory Syndrome (SARS).
