Ethan
Money List Winner
That helps with my understanding but could do with a little bit of clarification. Lets say I have been in contact with a person who has covid. Within what time period could it start showing as a positive result if I am tested. I am only looking at this in the context of the travel industry as the UK airlines are calling for people to be tested on return to the UK whereas my favourite holiday destination is currently allowing US tourists based on their production of a negative covid test no more than 7 days old. Is testing an option or could people infected still be producing a negative test result for a period after the initial contact.
If someone coughs a load of Covid in your face, it'll probably take at least a couple of days before your test shows positive, but can be a week or so. In that time, the little beasties are replicating within you and infecting cells throughout your body, but it isn't until you are shedding virus in decent quantities that you test positive. Symptoms occur after the test is positive, if they occur.
Note also that a negative test can arise for various reasons, including poor testing technique.
That means that the airport test is only useful for determining if you were exposed 2-7+ days ago, so you will probably have heard the suggestion that you get a test on arrival and one 5-7 days later. This makes sense. If you test negative on the second occasion, you should be released from quarantine. The holiday destination negative test thing is better than nothing but not very reliable. You may remember some debate about immunity certificates based on an antibody test showing prior exposure with antibody response. That was not favoured by Govt because it would set up a two tier system for restrictions, although they justified not doing it by saying that we did not know that antibodies confer immunity. I think we now have good evidence to suggest they do and I wonder if reviving that idea now has some value.