Infectious before positive test when asymptomatic?

[NauseousNancy]

Hoping someone can help me straighten my head out on this one.

My dh was in contact with someone who was covid positive. Tested negative on a pcr. Done daily pcr tests, and then after a few days this was positive and followed up with a positive pcr test.

When would be be infectious from? The date of the first positive lateral flow? Or still 48 hours previously?

It's defined as 48 hours before the positive test. Been working it out myself today as we've realised we're a close contact.

Thank you!

I just can’t understand how can be infectious while also showing negative on tests?

No

It’s 48 hours before symptoms or day of test is asymptomatic

So if his positive test was Sunday, he wouldn’t have been infectious before that?

I just went office gov ok so not sure

Do you mean daily LFT tests?
They arent accurate enough to rule out covid especially if you don't have symptoms yet. They give a lot of false negatives.

He would count as infectious for 48 hours before the positive test.

Sorry, yes, I mean daily lateral flow tests!

Trying to work out when we may be most likely to show as positive. We have to go for a pcr test tomorrow, but I am just concerned it may not show yet?