Is it possible that CD4 count of newly HIV infected patient falls below 200 within a year?

Yes. depends on what stage they were diagnosed.
AnythingIsPossible. Anything is possible. But how probable?There are some pretty nasty strains of the HIV virus out there, but also some pretty nasty medications our there now to fight it. Just deal with what's in front of you. Get the best medical advice from an HIV specialist.Take the meds. Stop entirely any risky habits, eat healthy,maybe some supplements,exercise if you can,find a support group and STAY POSITIVE!
The rate of CD4 loss. varies. Also, most diagnosed with HIV didn't just get it that month. Also, there can be an acute inflammatory disease with initial HIV infection with acute drop in CD4 thta is temporary if treated. Mostly no, CD4 mostly stays up.