I think that i have std what medicine can i buy

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What are the causes for sexual transmitted disease?

1.vairal as herpes simplex or hepatietes B C or humman papilloma virus 
2.or it can be HIV which cause AIDS 
3.bacterial infection as syphilies and gonorhea 
4.fungal infection as chlamydea

How to treat them ?

1.acyclovir for herps
2.elbasvir/grazoprevir for hepatities C
3.lamivedine adefovir  for hepatities B
4.cryotherapy for humman papilloma
5.penicillin injectin and doxycyclin for bacterial infection 
6. zidovadine lamivedine tenofvir for HIV 

What are the investigation ?

1.VDRL
2.ELISA
3.PCR
4.rapid test