While they are no scientific coloration found yet or not enough study for the coloration right now...
Here are my thoughts, during the virus "attack" your body induces natural biological immune response this response but the virus is dead so a lot of energy was put for nothing but the remains are still there... The body is creating more and more B cells to find the outsider maybe by luck they find a protein in the body but was mutated and attacks it. This attack of protein might uncover the" Autism" for a while and introduces symptoms for it. This might just be bad though. I admit I don't know enough or if they any evidence that can point to it. It could be other reasons as well. I going more towards other reasons and it was just luck that shows after