Covid-19: CDC reports issue with reagent used in PCR test sent to states and overseas — a Q&A

By on .

Dr. Daniel Lucey, who has responded to, and monitored information on outbreaks since 2001, has provided a series of updates and analysis on the outbreak, now an epidemic of 2019-nCoV, the novel coronavirus identified in Wuhan China, since Jan. 7. He continues to respond to and break down developments and data on the outbreak here.

Has a technical issue been identified with some of the U.S. Centers for Disease Control and Prevention PCR diagnostic tests that received U.S. Food & Drug Administration emergency use authorization and were sent to 50 States and other nations?

Yes. See this transcript  of the CDC novel coronavirus update telebriefing.

Were any patient specimens either false positives or false negatives?

No. Importantly and fortunately, the problem was quickly identified in laboratories in some states in the standard quality control testing phase BEFORE any patient specimens were tested.

How did CDC explain the problem whereby some states found “inconclusive results?”

CDC stated: “When a state gets the test kits, they have to verify that it works the same in their lab that it worked at CDC. And when some states were doing this, we received feedback that they weren’t — that it wasn’t working as expected, specifically some public health labs at states were getting inconclusive results and what that means is that test results were not coming back as false positive or false negatives, but they were being read as inconclusive.  Now, these were not tests being run on actual clinical specimens from potential patients.

Did there appear to be a problem with one reagent used in the PCR assay?

A:  Yes. As CDC explained: “These were part of the verification process, and because of that we are — when we evaluated what the issue is, we think that there might be an issue with one of the three assays and we think that maybe one of the reagents wasn’t performing consistently, so it’s a long story to say that we think that the issue at the states can be explained by one reagent that isn’t performing as it should consistently and that’s why we are re-manufacturing that reagent, obviously a state wouldn’t want to be doing this test and using it to make clinical decisions if it isn’t working as well as perfectly at the state as it is at CDC, so this is part of a normal process and procedure and redoing the manufacturing is the next step”.

Q: Where does PCR testing for Covid-19 stand in the United States as of Feb. 12?

A:   CDC stated Feb. 12: “Of course, I hoped that this week every state — and every state did receive a kit — every state would be up and running.  How long is it going to take?  I can’t tell you that for sure because I understand that not every state has completed their verification yet.  And it won’t be until we have results from every state that we know which states can continue and which states we need to — we need to get new reagents to.  We’re working closely with FDA.  Again, we do expect this week that some states may move forward.  Other states may need to get additional reagents from CDC, and I don’t have an estimate yet from our laboratory staff as to how long that takes, and when we do, we will definitely be, first, letting the states know and then letting you all know.”

Q: How long does CDC estimate before an antibody test is available to diagnose past infection?

A:   CDC stated: “We have the beginnings of the serological tests, because we now have patients in the United States, we’re able to collect additional specimens but we have to collect them over time so that we can have the appropriate timing of specimens to make sure that we understand what the immune response looks like.  Once we complete the gathering of those specimens from the patients we’ll be able to pretty rapidly, I would say within a couple of weeks, three weeks, four weeks, be able to have a test available but right now, we’re still in the range of testing of gathering the appropriate specimens from the patients in the U.S..”

Daniel Lucey, M.D. MPH, FIDSA, FACP, is an infectious diseases physician and adjunct professor of infectious diseases at Georgetown University Medical Center, a senior scholar at the Georgetown University O’Neil Institute, Anthropology Research Associate, Smithsonian Museum of Natural History and a member of the Infectious Diseases Society of America Global Health Committee.He has served as a volunteer medical responder to outbreaks that included the West Africa Ebola crisis. He has collected information on outbreaks starting in 2001 with cases of anthrax in 2001, and including smallpox vaccination 2002, SARS 2003, H5N1 Flu 2004, MERS in 2013, and Ebola in April, 2014, He has gathered, and is updating information on the current outbreak of pneumonia first reported in Wuhan City in the Hubei province of China.

2 thoughts on “Covid-19: CDC reports issue with reagent used in PCR test sent to states and overseas — a Q&A

  1. Ozlem Equils, MD, FAAP

    I am a past Associate Professor of Pediatric Infectious Diseases at Cedars-Sinai Med Ctr/UCLA, Chair of Adolescent Immunization Committee at the Immunization Coalition of LA County, member of Pediatric Infectious Diseases Society Education and Social media Committees and the president of an educational non-profit called MiOra based in Los Angeles. .

    Is CDC, H&HS and Dept of Health taking a proactive approach to stop the spread of COVID-19 like China did? I believe that the impact of COVID spreading and the fear may have a worse impact on our county. Therefore the goal should be to stop the spread right now.

    -did we activate an emergency response already?

    -time is of essence; in order to isolate those who are shedding COVID19 asympromatically, can we PCR test everyone through school and community clinics? Can we identify those who are immune? We have the best laboratories in the universities and commercial labs.

    -do we have an inventory of all ventilators, oxygen tanks, ICU beds, medications that have activity against COVID19 like chlororquine, oseltamivir, lopinavir/ritonavir etc in each state? These may be mobilized and shared with insitutions who need them within the state. Do we have a stockpile of ventilators, medications to be shipped to places of need?

    -in order to prevent COVID replication, transmission and spread, can we implement a protocol and get IRB approvals and INDs ready to potentially treat those who are shedding the virus asympromatically with safe medications like oseltamivir or chloroquine or kaletra, and assess viral shedding?

    -hyperimmune plasma may be used to treat those who are ill; China reported that they are doing this. Do we have a program with blood banks to safely collect plasma from those who recovered from mild COVID-19 infection? Can blood banks test the blood they are getting for COVID19 antibodies? We may identify immune individuals who may be useful later.

    -is there a process in place to transport food and medicine to people who may be quarantined? People in China have been in quarantine for 5 weeks now and it looks like they are not coming out soon.

    -we expect that many people will be loosing their jobs, because of a contracting economy; do we have an emegency system in partnership with government, financial, religious, farming, food manufacturing organizations to provide food and housing to those who will loose their jobs? Can the government requires businesses implement extended sick leave with pay to those who are ill and people who are caring for them?

    Thank you

  2. Pingback: COVID 19: Reports document exposures of first recognized health worker infections | Science Speaks: Global ID News

Leave a Comment

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.