Thanks for the query.
Yes chlamydia can be the causative agent for your condition.
Asthenoteratozoospermia means decrease in count as well as motility of sperms.
Both of these are required for normal pregnancy
However it is not a contraindication for IVF.
you can go for IVF, but first chlamydia must be treated
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.