He might have gotten into the taxi by himself without knowing that others would bring a woman dying from Ebola into the taxi with him.
He held her legs on way to hospital, she had convulsions, one of the other people in that taxi has already died and he rented a room from the parents of the pregnant girl in the taxi who died. I would probably have lied to get her too but it still ticks me off. He knew he had to get to USA quick.
And this really pisses me off! The freaking docs the first time game him antibiotics for probable low grade viral infection. Every time you turn on a TV there is a doctor saying do not take antibiotics for viral infections but they prescribe it anyway.