I caught a flu on Dec 23rd. Tested negative for A/B. Continued to have it. Went back in January still with the flu. Tested negative again for A/B and still had

I caught a flu on Dec 23rd. Tested negative for A/B. Continued to have it. Went back in January still with the flu. Tested negative again for A/B and still had effects from it past Jan 20th. I felt like I was dying and my lungs were full of really bad stuff. Around the time I would have showed antibodies you could not get a test in the US. Needless to say, I believe the virus was around before it had been noticed. That time frame of late Dec is normal flu season. Many people could have been walking around with covid and no one would have noticed.