Hello dear, Thank you for your contact to health care magic. I read and understand your concern. I am Dr Arun Tank answering your concern. No, snorting meth never causes strep infection. The selling at the back of the throat is because of the irritation that has occurred by the meth snorting followed by secondary infection to the injured area. U advice you to take the antibiotic cefixime, antiacidity agent pantoprazole and paracetamol under your doctors guidance. This regimen will cure your infection. Hexideine gargle can help clear the infection earlier your can also take it with your doctors guidance. Please maintain good oral hygiene thus will equally help as antibiotics is doing. I will be happy to answer your further concern on bit.ly/DrArun. You can hit thanx if you are helped. Thank you, Dr Arun Tank Infectious diseases specialist, HCM.