More than half of states may be undercounting coronavirus cases by not following CDC guidelines

At least 28 states are not following US Centers for Disease Control and Prevention guidelines on reporting new Covid-19 cases -- half of which saw the trend of new cases increasing in the last week.

Those states are not reporting probable cases, according to the daily case count listed on the CDC's website. Probable cases include those that show evidence of an infection without the confirmation of a lab test and cases where coronavirus was listed as a cause or contributing cause of death but are not confirmed with a...