How long before we know if reopenings cause virus spikes?


FILE – In this Wednesday, May 13, 2020 file photo, Sheila Kelly, owner of Powell’s Steamer Co. & Pub, center, stands behind makeshift barriers as she helps patrons at her restaurant in the El Dorado County town of Placerville, Calif. It was the first day Kelly was serving in-dining meals since the state’s lockdown order to slow the spread of the coronavirus. El Dorado County was one of the first counties to win approval from the state to reopen for dining-in. (AP Photo/Rich Pedroncelli)

U.S. states and countries worldwide are cautiously relaxing restrictions while watching for potential spikes in coronavirus infections. Getting the timing right is complicated. Disease trackers note the impossibility of seeing clearly what’s happening without widespread testing.

A look at when we might start to see any health impacts of reopening:


The virus can circulate undetected, then flare up in a nursing home or after a family gathering. So it could be several weeks to see surges in infections. What’s more, there are still new infections happening now during lockdowns. Some parts of the U.S. are seeing increasing numbers of daily new cases and some are seeing declines. Health officials will be looking at the number of new cases per day and the percentage of positive COVID-19 tests.


After exposure to the virus, it can take three to five days for someone to feel sick, and many infected people won’t have symptoms or only mild ones. Some with mild illness might delay getting tested. It can take another few days to get test results back and report them. All told, it can take two weeks or so — the time for one group of people to spread the virus to another — to have enough testing data. Crystal Watson of the Johns Hopkins Center for Health Security said it will take a few rounds of infection spread — five to six weeks — to know how reopening has affected epidemic curves.


Ideally, investigators would call people who test positive, track down their contacts and get them into quarantine before they can spread the virus to others. There’s evidence the coronavirus can spread before people feel sick, making it important to act quickly. States are just starting to expand their ability to do this contact tracing. Without adequate testing and contact tracing, returning to restrictions or a lockdown might be necessary if there is a surge in infections.


The Associated Press Health and Science Department receives supportfrom the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely responsible for all content.

Copyright 2020 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

Link to 12 things you need to know page

WBOY 12 News Facebook Page

Trending Stories