There are now more than 2 million confirmed cases of COVID-19 in the U.S., according to Johns Hopkins University, and health officials fear some areas will see a spike in new infections over the next few months.

"Right now we have between 800 and 1,000 people dying every single day in America. And all of the models, all of the data suggests that things are going to get worse, we're going to have increases," says Dr. Ashish Jha, of Harvard Global Health Institute.

The Harvard Global Health Institute predicts 100,000 more coronavirus-linked deaths in the United States by September.

A total of 12 state have seen coronavirus rise since Memorial Day, according to data from the COVID tracking project. In addition, there has been at least a 10% increase in week to week cases reported in 19 states, according to Johns Hopkins University.

"Hospital leaders, they should be preparing for the next surge now, so that we don't run into the problem of not having enough masks and personal protective equipment. I mean it was a national disgrace that we ran out last time," says Dr. Leana Wen, the former Baltimore health commissioner.

Johnson and Johnson is expected to start double-blind, randomized human vaccine trials next month, but in the meantime, health officials remind Americans to be cautious.

"I'm not trying to scare people to stay home, what I want is people to wear masks, I want them to do social distancing," says Dr. Ashish Jha, of Harvard Global Health Institute.

More than 7.3 million people around the world have been confirmed to be infected with the virus, according to Johns Hopkins University figures. At least 416,00 have died.