Corona virus live updates: 9 US states have increased cases in the last 7 days

ABC News analysis of COVID-19 trends in 50 U.S. states and Washington, D.C. and Puerto Rico has seen an increase in newly confirmed cases in 33 states and in Puerto Rico over the past two weeks.

The seven-day average in the United States is the highest since August 22, which is a national trend, with health experts warning that cold temperatures could increase the spread of the virus.

There was an increase in the daily positive rate of COVID-19 testing in 25 states, an increase in COVID-19 hospitals in 35 states, and an increase in the number of daily COVID-19 deaths in Washington, DC, and 18 states.

Four states – Nebraska, Montana, South Dakota and Wisconsin – have reached a record number of current COVID-19 hospitals per day. Nine states – all in the Midwest and West Indies – have seen an increase in COVID-19 cases in the past seven days.

Since September 13, the seven-day national average for new cases has increased by almost 25%.

All trends were analyzed from data collected and published by the Govt Monitoring Program over the past two weeks using the linear regression trend line of the seven-day moving average.

ABC News’ Benjamin Bell, Brian Hartmann, Surin Kim and Ariel Mitropoles contributed to the report.