Flu activity remains "unusually low" in many parts of the United States this year.<br />Experts say masking and social distancing to prevent the spread of COVID-19 may be the reason.<br />Just 40 of more than 22,000 specimens evaluated at U.S. hospital labs tested positive for the flu.<br />16 of more than 16,000 evaluated at public health labs in the country during that week tested positive.<br />Less than 2% of all doctor visits across the country over the same period were related to the seasonal bug.<br />Wearing a mask and washing hands has proven incredibly effective, says UPI.
