Can I enter the US with a certificate of COVID recovery if I only have an official positive test from the past 1-2 days?

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(The below is over-simplified and thus not necessarily technically correct on all levels - but it's good enough for a travel site!)

Broadly speaking there are two common types of tests used for COVID-19 (or more specifically, for the presence of the SARS-CoV-2 virus which causes it) - PCR and RAT.

PCR, which stands for Polymerase Chain Reaction looks for genetic material - DNA - of the SARS-CoV-2 virus. It can detect small quantities of this material in the sample, but does not differentiate between whether this genetic material is a live virus, or traces from a previous infection. As a result, it's possible for a PCR test to return a positive result for several weeks (or even in some case, several months) after the infection has passed.

In effect, this means that PCR tests are a great indicator of the fact you either are currently or have recently been infected with the SARS-CoV-2 virus, but they are NOT a good indicator of the fact you have recovered from an infection.

As this was a problem when using PCR testing, most countries allowed the concept of a "Certificate of Recovery", which allowed a doctor to confirm that you were (likely) no longer infected based on a number of factors, including a previous positive test, a time period since that test was taken, and the fact you were no longer showing symptoms. This could be used for the purposes of travel, even if you were still testing positive with a PCR test due to traces of the (dead) virus still being in your sample.

RAT, which stands for Rapid Antigen Test, doesn't look for genetic material, but instead they detect the presence of a specific viral antigen, which is an indication that you are currently infected with the SARS-CoV-2 virus.

Unlike a PCR test, RAT tests do NOT continue to return positive results once the virus is no longer in your system. If a RAT test is returning a positive result, then there is a very high probability that you are still infected, and likely still contagious.

There is no real need for the concept of a "Certificate of recovery" when using a RAT test, as once you have recovered the RAT results will show a negative result (unlikely PCR where they can remain positive). That's not to say that you can't obtain such a result from a doctor, and use it for travel, just that there's no specific need UNLESS you have a requirement to take a PCR test for the purposes of travel.

For your specific situation, where you are still testing positive with a RAT, the answer is simple - you should not travel! No respectable doctor will issue you with a Certificate of recovery if you are still testing positive with a RAT test (especially if your only proof of a positive test is only a day or two old!), and you are most likely still contagious so should not be travelling on public transportation.

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