One of those mysteries: why the experience can be so different from person to person. One expert says the answer may involve looking at previous vaccines individuals have had.
“When we looked in the setting of Covid disease, we found that people who had prior vaccinations with a variety of vaccines — for pneumococcus, influenza, hepatitis and others — appeared to have a lower risk of getting Covid disease,” Dr. Andrew Badley, an infectious disease specialist at Mayo Clinic told CNN’s Anderson Cooper on Monday night.
It’s what immunologists call immune training: how your immune system creates an effective response to fight off infections, Badley says.
“A good analogy is to think of your immune system as being a muscle,” he said. “The more you exercise that muscle, the stronger it will be when you need it.”
But once you’re infected, how much of the virus made it into your body could also have an impact on what your experience is, another expert told CNN on Monday.
Gandhi’s team found masks make a difference.
“What the mask does is really reduce the amount of virus that you get in, if you do get infected,” she said. “And by reducing that … you have a lower dose, you’re able to manage it, you’re able to have a calm response and you have mild symptoms or no symptoms at all.”
So far, more than 5 million Americans have tested positive for the virus and at least 163,473 have died, according to Johns Hopkins University data.
The average number of daily new cases in the US is more than 54,000, down from more than 65,000 per day in mid- to late-July.
Average daily Covid-19 deaths, however, have hovered above 1,000 for more than two weeks. The country had been below that level for seven weeks before that.
90% increase in child cases in a month
More research is also emerging around children and coronavirus amid back-to-school season.
The report said 179,990 new Covid-19 cases were recorded among US children from July 9 to August 6.
More than 380,000 children had been infected as of August 6, according to the report, making up just over 9% of the total cases in states that report cases by age.
And while some US officials, including the President, have said the virus doesn’t pose a big risk to children, experts say that’s not the case.
“It’s not fair to say that this virus is completely benign in children,” Dr. Sean O’Leary, vice-chair of the American Academy of Pediatrics Committee on Infectious Diseases, said Monday. “We’ve had 90 deaths in children in the US already, in just a few months. Every year we worry about influenza in children, and there are roughly around 100 deaths in children from influenza every year.”
In Mississippi, at least 22 schools across the state have reported positive cases, State Health Director Dr. Thomas Dobbs said this week. There have been 19 cases reported among students and 15 cases among staff.
Cases spiked in nursing homes due to community spread, group says
Covid-19 cases rose rapidly in US nursing homes in July after a steady decline in June — signaling a serious risk to an especially vulnerable group of people, a health organization said Tuesday.
The jump in nursing home cases was due to an overall jump in cases in the general population, and it should spur the US government to take steps to protect the homes, the American Health Care Association and National Center for Assisted Living said.
“We need public health officials to focus on reducing spread within the larger community and prioritizing long term care for resources, like (personal protective equipment), testing, staff support and funding, so we can prevent the virus from coming in to nursing homes and help staff take targeted action if it does,” Mark Parkinson, CEO of the AHCA/NCAL, told CNN Tuesday by email.
New weekly Covid-19 cases in nursing homes dropped from 9,072 at the end of May to 5,468 by June 21 — but then rose to 8,628 for the week of July 19, the last week for which data is available, the group said. The group cited data collected by the Centers for Medicare & Medicaid Services.
The report said this confirmed fears the group had: That cases would rise in nursing homes as they spiked in the wider community across the country from June to July.
CNN’s Jen Christensen, Andrea Kane, Jamiel Lynch and Jason Hanna contributed to this report.