Sti questions

Thing is, she only had oral sex with the guy and swallowed. 

I told her she didn't have to worry about it but to go ahead and get tested. she said that you can get chlamydia through oral and get the infection in your vagina through that. Because her friend did oral with someone that had herpes and broke out in genital herpes. I was like 1. Herpes is a virus not an infection. And 2. if you give someone with herpes oral sex, you'll get oral herpes, not genital herpes. Am I correct? It's been a long time since sex Ed in highschool. 

But the pole question is, can you get chlamydia in your vagina if you've only had oral sex? She swears up and down you can. I've never heard of that in my life.