States have a long way to go on testing, review shows

People waited in line at a coronavirus testing site outside the Bowdoin Street Health Center in Dorchester.David L. Ryan/Globe Staff

More than half of US states, including Massachusetts, will have to significantly step up their COVID-19 testing to even consider starting to relax stay-at-home orders after May 1, according to an analysis by Harvard researchers and STAT.

Massachusetts is doing more testing than most other states, the report said, but it’s still not nearly enough: It would have to conduct 30,000 tests a day to be assured of promptly identifying most infected residents, but in the past week it averaged just above 10,000 a day.

The analysis shows that as the United States tries to move beyond its months-long coronavirus testing debacle — faulty tests, shortages of tests, and guidelines that excluded many people who should have been tested to mitigate the outbreak — it is at risk of fumbling the next challenge: testing enough people to determine which cities and states can safely reopen and stay open. Doing so will require the ability to catch reappearances of the coronavirus before it again spreads uncontrollably.

The White House has repeatedly expressed confidence about the states’ ability to do enough testing to begin a phased reopening of the economy. In a briefing Thursday, President Trump said he disagreed with comments by Dr. Anthony Fauci, the top government infectious disease expert, that “we are not there yet” with the number of tests and the capacity to perform them. “No, I think we’re doing a great job in testing,” the president said.

But the new state-by-state review reveals a far more fragmented picture: 31 states and the District of Columbia were doing too little testing last week to identify most infected people in a timely manner. Ten states would need to increase their daily testing totals by at least 10,000 to do so by May 1. New York, for instance, would have to perform more than 100,000 more tests a day, and New Jersey 68,000 more. Nineteen states — all but two in the South or the western half of the country — are already doing enough testing.

Most assessments of the amount of testing that will be needed over the next few months are national. But while those are a good starting point, they do not give individual states, let alone cities, much guidance. “You can’t just take the national number and scale it to states by their population,” said Ashish Jha, director of the Harvard Global Health Institute. “You have to base it on the size of the outbreak in a state.”

At STAT’s request, Jha and his colleagues at the institute calculated the number of tests that each state would need to be doing as of May 1. STAT then compared those numbers to each state's daily testing totals in an average week in mid-April, using data collected by the Covid Tracking Project.

The results show that states with few COVID-19 cases and deaths so far will need to perform relatively few tests: 68 to 145 per day in Alaska and 31 to 156 in Montana, for instance. States hit harder by the pandemic face a much heavier lift: New York would have to do 130,000 to 155,000 tests every day, New Jersey 75,000 to 90,000, and both Massachusetts and Illinois about 30,000 to 35,000.

Many hard-hit states are not even close to their goals. New York, for instance, has been averaging 20,000 to 25,000 tests per day. New Jersey has been doing about 7,000. Neither has announced reopening plans or dates, giving them time to ramp up testing. Illinois is conducting about 10,000 a day. Connecticut and Colorado are almost 15,000 tests a day below their May 1 targets. Texas, with more than 9,000 tests a day, and Washington state, with more than 3,000, are already doing enough.

The more worrisome gap involves states that, despite having thousands of COVID-19 cases, are easing mitigation strategies by, for instance, allowing more businesses and public spaces such as beaches to reopen. To catch hot spots before they turn into wildfires of disease, Georgia must do 9,600 to 10,000 tests per day; it has been averaging around 6,000. Florida will need 16,000; in the last week it has been hitting just above 12,000. South Carolina is a rare bright spot: It will need 1,200 to 1,600 tests per day and has been averaging close to the low end of that, with at least 1,500 tests on several recent days.

In the last week, the nation as a whole conducted 1.6 million tests, according to the Covid Tracking Project. The Harvard team says twice that many tests will be needed — at minimum.

Performing enough tests is only one of the essential steps before states can reopen, experts say. Test results also have to be returned more quickly, public health workers must identify and contact potentially exposed people, and hospitals and nursing homes require adequate amounts of personal protective equipment and other supplies in case a new wave of seriously ill patients crashes over them.

The Harvard institute based its calculations on best-case scenarios. If the goal were not to miss a single new infection, “you would need more than 300 million tests a day,” said Jha — testing nearly every resident of every state every day (or every few days). “That’s an interesting theoretical exercise but since it’s not going to happen, it’s policy-irrelevant. If you say that, people stop listening.”

Instead, he said, “we tried to come up with numbers that wouldn’t make governors gag.”

Jha and the institute's Ben Jacobson crunched the numbers two ways for each state. Both start with the number of deaths projected for May 15 by Los Alamos National Laboratory, whose Covid-19 model the Centers for Disease Control and Prevention consults. Los Alamos projects that, nationally, the death toll on that day will be 545 — but more if states keep easing up on social distancing. For comparison, on April 25, the U.S. reported just over 2,065 new Covid-19 deaths.

The researchers then assume that deaths on May 15 will reflect the number of cases on May 1, since two weeks is the average time between infection and death. If 1 out of every 100 people diagnosed with Covid-19 dies (for a “case fatality rate” of 1%), then on May 1 there would be 100 times as many new cases as there would be deaths on May 15; call it 54,500 (545 times 100) cases on May 1 for the country as a whole.

To control the epidemic, public health workers would need to identify more than 54,500 new cases on or around May 1 in order to trace and test their contacts, quarantining those who also test positive.

A lot of assumptions — case fatality rate, test positivity rate, and more — went into these calculations. But other researchers have come up with approximately the same number via different reasoning.

Last week, an analysis by the Rockefeller Foundation concluded the United States should test 3 million people a week. Vital Strategies, the nonprofit headed by former CDC director Tom Frieden, recommended a minimum of 450,000 tests per day.

As in the Harvard calculation, the national testing goal of 450,000 would not be evenly distributed according to state (or city) population, said epidemiologist Cyrus Shahpar of Vital Strategies.

The White House has said that individual states and cities need to do roughly 30 tests per 1,000 people per month, as Deborah Birx, the White House’s COCID-19 response coordinator, explained at a recent briefing, citing New Orleans’ 27 tests per 1,000. Birx said that all but three states — Oregon, Maine, and Montana — had the ability to do that many tests and that the administration is working with states to ensure all the potential for testing is “brought to bear.”

Sharon Begley can be reached at [e-mail]. Follow her on Twitter @sxbegle.