Reinfection within a month?

[KloppsTeeth]

We all had Covid in December and were told not to do a LFT or PCR for 90 days. My youngest has cold symptoms, less than 4 weeks after a positive PCR.
What is the latest advice? I can’t keep up. Is it to test if they get new symptoms? Covid is all round his school, as it was before Christmas.
Normally I would send him in as he has very mild stuffy nose symptoms, would you keep him home from school?

You can do a new pcr if symptoms. Reinfection in a month is getting more and more common. All 5 of us have covid right now, 4 of us presented with colds. One asymptomatic.

I think the 90 day thing is only for PCR tests? LFD tests should go negative as soon as you stop being infectious after each case (so about 5 to 15 days). So a positive LFD now would indicate a current (new) infection.

If you had delta in December, it's quite plausible you could have covid again, Omicron this time. If you had Omicron in December, you almost certainly haven't got it again. It's like a different virus. Depending on when in December you caught it, and where in the country you were will give more idea what you had last time. Earlier in December and (approximately) closer to London, the more likely it was Omicron.

@altmember is correct - Pcr won't give you any new information now but if you were negative on LFT and are showing positive again then it's likely a reinfection

We tested positive in early December with what I assume was delta as we live remotely and our infection rates are slightly behind the rest of the country.

Last week ds tested positive on LF and PCR. Then myself, dh and dd had positive LFs. DHs PCR was positive, mine and dds were negative. Very odd. I'm still assuming that we all have omicron as I've had 6 positive LFs.

Thanks, we test him in the morning on an LF. No idea which type we had, likely Delta as we live rurally.

I also understood that you shouldn't take a PCR within 90 days, but LF are OK. I think that the PCR being more sensitive, can pick up 'old' virus, but LF tend to pick up mostly when your infectious. We all had Covid in December, the whole family had positive tests between 16th Dec - 21st. Y5 DD brought it home from school as it was rife. Over this weekend about 25% of her year group have tested positive again, despite most of them having had it in December. It was so rife they shut the school for a week. I'm fully expecting them to have to close again, and given we're London based, I suspect it's a second round of Omicron.