Hello,
Thank you for your query at DoctorSpring.com
I understand your concern, but let me assure you there is nothing to worry.
If you got any infection, you would have shown symptoms.
So, do not worry at all about that.
Regarding weight, some people have difficulties putting on weight. You can take Nutrigain supplements along with regular muscle work out and protein supplements along with it. This will help you gain lean muscle mass, and put on weight.
Hope this was helpful,
Regards.