The US National Institutes of Health (NIH) said it has discovered “several dozen” new coronaviruses.
There are now 5,813 people who have tested positive for COVID-20, including 2,534 new cases in the United States and 1,945 in Canada.
The US Centers for Disease Control and Prevention (CDC) said the number of new cases is expected to rise over the next few weeks.
The number of deaths from COVID has surpassed 6,000.
It has killed more than 13,000 people worldwide and has been linked to more than 2,500 cases in US states and Washington, DC.
The number of cases is increasing rapidly.
As of Tuesday, US states had reported 6,664 new cases of COVID.
There are now more than 7,500 people living with COVID, according to the US Centers.
The first coronaviral case in the US was in a New York hospital in November, when a patient developed severe pneumonia and died.
The US Centers said the new cases were more than double the average in the first six months of the year.
The coronaviremia death toll has surpassed 1,000 in the USA.
“Our first coronovirus death in the country, a New Jersey patient, was in March,” the CDC said.
“The number continues to climb.
The average number of COVI cases in each state is now more often than not over 6,500.”
The new coronoviruses are most commonly transmitted via direct contact with infected blood or blood-contaminated surfaces, such as hospital surfaces, bedding or towels.
The pandemic has also spread to people living in remote areas and to people in countries with a history of coronaviris infections, including China, the Philippines, Pakistan and Indonesia.
In the US, coronavids are now common in children, who are more likely to be exposed to a COVID infection than adults.