Chlamydia - how infectious?

[Peter Larsson]

I've been wondering about how infectious the STD Chlamydia really is.

Must there be intimate contact such as intercourse to transfer the
bacteria? Or is it enough if, for example, vaginal fluid gets on a man's 
fingers, and then the fingers touch his penis? How can the bacteria 
spread outside the body? Can they themselves move from the base of the 
penis into the urine opening at the top?

How long or short is the incubation period?

Thankful for any response
Peter