U.S. grapples with how to drastically ramp up COVID-19 contact tracing

As federal officials weigh how and when to reopen the country, experts say the United States does not have enough public health workers to suppress another outbreak, especially those qualified to do contact tracing, the critically important effort to find people who may have been exposed to the virus.

Peace Corps, health-care students among options to address need that could number in tens of thousands

Public health nurse Lee Cherie Booth conducts a test for COVID-19 outside of the Salt Lake City Public Health Center on April 10, accompanied by Salt Lake County infectious disease nurse Travis Langston. (Scott G Winterton/The Deseret News/The Associated Press)

Before Washington state lifts its stay-at-home order, public health workers in Seattle's King County want to be ready to douse any new sparks of infection.

That task, they say, requires at least 20 more investigators to call people who test positive for the coronavirus, track down their contacts and get them into quarantine. Without the extra help, the workers insist, the state can't possibly be ready to resume normal everyday activities.

"We are trying to build these teams and processes in the midst of a crisis," county health spokesperson Sharon Bogan said.

The challenge extends well beyond Seattle. As federal officials weigh how and when to reopen the country, experts say the United States does not have enough public health workers to suppress another outbreak, especially those qualified to do contact tracing, the critically important effort to find people who may have been exposed to the virus.

The Johns Hopkins Bloomberg School of Public Health estimated it could require 100,000 people, while Dr. Tom Frieden, the former head of the U.S. Centers for Disease Control (CDC), believes the number could be as high as 300,000.

Both estimates represent a daunting number given that the combined federal, state and local public health workforce has been shrinking and is now probably less than 280,000, according to some estimates.

The budget approved by Congress for the CDC has fallen by 10 per cent between 2010 and 2019 when adjusted for inflation, according to the nonprofit group Trust for America's Health, and that has had a trickle-down effect at state and county levels.

The problem has inspired some novel ideas, including enlisting Peace Corps volunteers, furloughed social workers and public health students. San Francisco is training librarians, medical students and people who work for the city attorney's office.

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While the exact number of workers needed is a subject of debate, a top federal health official this week acknowledged the mandate to find many more.

"Everybody agrees that our public health capacity at the local and state level is not ready to take this on at a very large scale without reinforcements," said Dr. Anne Schuchat of the CDC, who oversees the agency's coronavirus response work.

The extra workers would help conduct testing, isolate sick cases and trace everyone those sick people had contact with.

New funds approved for response efforts

It's crucial that such a system be in place before government officials ease physical-distancing guidelines, reopen schools or lift stay-at-home orders, said Frieden.

"If we have explosive spread when we reopen, we'll have to close again. That will be very damaging, not just economically but from a health standpoint," he said.

The U.S. government has funnelled about $800 million US to states for coronavirus response work that can include contact tracing. And on top of hundreds of staff sent to states to help with coronavirus work, the CDC has already assembled "community protection teams" of six to 12 people each to do contact tracing and investigate tools that could help with it. Some have already been deployed to states where spread of the virus has been relatively low.

A smartphone belonging to Rhode Island native Drew Grande shows notes he made for contact tracing on Wednesday. Grande began keeping a log on his phone at the beginning of April, after he heard Gov. Gina Raimondo urge residents to start out of concern about the spread of the coronavirus. (Steven Senne/Associated Press)

Tiny Rhode Island has nearly 100 people "focused on nothing but contact tracing," reaching out to hundreds of contacts of infected people each day, Gov. Gina Raimondo told reporters. She has urged all state residents to take a minute each evening to write down who they physically encountered that day and where those encounters took place.

"If I'm going out to the store, I'll put the date, what store I went to and then the time I was there," said Drew Grande, 40, of Cranston, R.I. He started a contacts diary on a note-taking app on his phone after he heard the governor's request.

Contact tracing has changed over the last few months in the U.S. When the first handful of infections were being identified, teams of 20 or more might be assigned to each confirmed case. Investigations would often start with a staffer or two doing an in-person interview at a hospital bedside. Disease trackers might spend hours asking a sick person and that person's relatives who they had been in contact with since symptoms surfaced.

In-person interviews are often better, said Isaac Ghinai, a CDC disease tracker assigned to work with Chicago's health department.

"There's a value to looking someone in the eye. You can build a relationship face to face that you can't always do by phone," he said. Some people are comfortable sharing personal details over the phone but others "require more cajoling."

With hundreds of new cases emerging each day in Chicago, that kind of attention to individual infections has largely stopped. Instead, the priority is large groups of people who are particularly vulnerable, like those at nursing homes or homeless shelters. Many new confirmed cases are not being investigated, and when they are, the interviews may be done by only two or three people, and over the phone, Ghinai said.

Lack of testing materials, too

Could there be a digital solution? Apple and Google are teaming up on a contact-tracing app, and other efforts use Bluetooth to gather data from phones that came close to an infected person. Seattle scientist Trevor Bedford has developed a digital interview that public health departments can use if they don't have enough people trained in contact tracing.

Whatever the solution, it will take a while.

People have to be tested and diagnosed before contact tracing kicks into gear, and testing remains limited in many parts of the country. This week, the Association of American Medical Colleges sent a letter to the White House Coronavirus Task Force saying that testing materials and machines remain in short supply.

President Donald Trump has floated the idea of easing at least some restrictions as early as May 1.

Some observers believe restrictions could be eased first in places where the spread is low, if rigorous testing and contact tracing could prevent a sudden explosion in infections.

But Schuchat warned that "there is no way the entire country could relax mitigation on May 1 and the country not experience a major resurgence."

With files from CBC News

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