Corona, but no antibodies?

My 13 yr old daughter has been very sick for the whole month of February 2020, all symptoms corona she has had. She has lost 9 kg in 2 months and until today (01-01-2021) she is still very tired. I myself have been very short of breath in that period and it felt like I had burning lungs. At that time there was no testing possible, so I had my daughter tested for Pfeiffer instead of corona. This did not come out. Last week we received the results of a blood test (for antibodies to corona). But her blood was good. Yet it still does not feel good.

Recognizable story. My husband of 69 years also had a weird, atypically severe flu for weeks in February 2020, with huge dry cough, fever, shortness of breath and overwhelming fatigue. I had never seen it like that before. Myself in early March: dry coughing, waking up from nighttime shortness of breath and completely out of breath from a short walk. While my condition is fine. But otherwise mildly ill. My blood test did not show any antibodies either (far below the signal value). But I still have the feeling that we did not have an 'ordinary' flu.

No corna, but it doesn't make antibodies in a rapid test.

It's possible the rapid test was a false positive. Where, what brand did you buy this from, Wester?

I myself have been in contact with a positively tested person. The contact was on 23/04/2021. The person tested positive on 24/04. So I had to have a PCR test done because of my work. This was negative on 24/04. On Wednesday 28/04 I did get symptoms myself, did a self-test and immediately signed positive. I called my family doctor who gave me a PCR test: strongly positive and very contagious. I remained in quarantine but never avoided contact with my husband (they slept together). I have been very ill for a few days: fever (always around 38 degrees), sore throat, blocked nose, eye problems, listless and very tired.... A heavy 'flu'. I have hardly been out of bed for 5 days. My husband and son never got sick despite my highly contagious state. About a month later I had a blood test for Ig M and Ig G. The test was positive for Ig G. What I find strange is the way I was infected: I was in the same room as the infected person (in that person's living room), both wearing masks, me wearing a medical mask and at a distance from each other (at least 1.5 m). So how did this happen ? Is the contamination greatest via a room that is not ventilated, where the infected person was already staying the whole time ? Is there any sense in the masks and the distance ....

my daughter with in april 2020 corona had 3 weeks well ill, in june 2020 blood test showed that she had no antibodies after her corona. now again corona had and she was fully vaccinated in march 2021, now back to test for antibodies