- What You Need to Know
- Getting Tested
- CDC Vaccine Data Tracker
Vaccine Rollout as of Apr 01:
Total Distributed: 4,989,325. Total Administered: 4,140,842.VA Vaccine DashboardCDC COVID-19 Vaccines
Visit your state's vaccine dashboard to learn more about their distribution guidelines. The CDC also has updated information on COVID-19 vaccines, including recommendations processes, differences about the different types, their benefits, safety data, and frequently asked questions.Crisis Text Line
- What You Need to Know
Nov 03, 2020 · Interim Guidelines for Clinical and Public Health Settings In general, a positive antibody test is presumed to mean a person has been infected with SARS-CoV-2, the virus that causes COVID-19, at some point in the past. It does not mean they are currently infected. Antibodies usually start developing within 1 to 3 weeks after infection.
Mar 17, 2021 · Persons suspected of COVID-19 illness who test positive by direct viral detection methods for SARS-CoV-2 (e.g., polymerase chain reaction or antigen detection tests) typically begin to develop measurable antibody 7-14 days after illness onset and by 3 weeks most persons will test positive for antibody.
Mar 17, 2021 · Types of tests. COVID-19 tests are available that can test for current infection or past infection. A viral test tells you if you have a current infection. Two types of viral tests can be used: nucleic acid amplification tests (NAATs) and antigen tests. An antibody test (also known as a serology test) might tell you if you had a past infection. Antibody tests should not be used to diagnose a current infection.
Mar 11, 2021 · Antibody tests indicate you had a previous infection and that you may have some level of protection against the virus. Experts are currently looking at how COVID-19 vaccination may affect antibody testing results.
Mar 17, 2021 · Vaccination and SARS-CoV-2 Testing. Prior receipt of a COVID-19 vaccine will not affect the results of SARS-CoV-2 viral tests (NAAT or antigen).Because the Pfizer-BioNTech, Moderna, and Johnson & Johnson COVID-19 vaccines use the SARS-CoV-2 spike protein to generate an immune response, a positive serologic (antibody) test for spike protein IgM/IgG could indicate either previous infection or ...
Feb 02, 2021 · Antibody tests should not be used to diagnose a current infection with the virus that causes COVID-19, except in instances in which viral testing is delayed. An antibody test may not show if you have a current infection because it can take 1–3 weeks after the infection for your body to make antibodies.
Dec 16, 2020 · CDC considers low prevalence to be when NAAT positivity over the last 14 days is less than 5% or when there are fewer than 20 new cases of COVID-19 per 100,000 persons within the last 14 days. See CDC’s Indicators and thresholds for risk of introduction and transmission of COVID-19 in schools.
Jan 12, 2021 · The Centers for Disease Control says COVID-19 rapid tests are less accurate than first believed. When the FDA approved them for emergency use months ago, researchers thought they were about 97 ...
Most if not all large scale COVID-19 antibody testing looks for binding antibodies only and does not measure the more important neutralizing antibodies (NAb).    A NAb is an antibody that defends a cell from an infectious particle by neutralizing its biological effects.