Here's Dr Handsfield commenting on Chlamydia/oral in a 2010 post:Re Doctor Handsfield's comments on chlamydia from medhelp.org, i found these somewhat dated
(early 2006) remarks, saying it rarely if ever is transmitted by oral sex, or at least from mouth to penis. Whether or not he meant to include transmission the other way, from penis to mouth, or DATY in either direction, is unclear to me.
"...chlamydia has been found in the throat, but it is so rare CDC (in its own treatment guidelines--i.e, from the science side) recommends against testing for it, and that recommendation will be stated even more strongly in the coming revision of those guidelines, due for release ~June. Oral to genital transmission of chlamydia has never been documented, to my knowledge. And in data reviews in the Seattle STD clinic, men with NGU who say they have only received oral sex in the preceding 2 months--i.e., no vaginal or anal--rarely have chlamydia. (Those that do are mostly carrying chlamydia for longer than the 2-month time frame covered by the question.) "
"...It's the latter, "the reporter not understanding what was said". I spoke with several reporters when that study (by investigators in Melbourne, Australia) came out, because I wrote an accompanying editorial. Some tried to spin their stories to emphasize the supposedly high risk of oral sex. Just like the data from Seattle I cited above, it is likely that the Melbourne chlamydia-infected men who claimed only oral sex recently and also had chlamydia either were giving inaccurate information about their sexual practices, or had been carrying chlamydia in their urethras longer than the window period for the sexual activity questions. In other words, the Melbourne study suggests that chlamydia is transmitted by oral sex infrequently, if ever."
http://www.medhelp.org/posts/STDs/CANT-SEEM-TO-GET-A-DEFINITIVE-ANSWER/show/247660
http://www.medhelp.org/posts/STDs/Anyone-ever-get-Chlamydia-through-receving-oral/show/1568207
http://www.cdc.gov/std/Chlamydia/STDFact-Chlamydia.htm
"You'll find lots of information on the web and elsewhere saying chlamydia is acquired by oral sex, but it's wrong -- even though such statements often come from apparently authoritative sources, such as public health departments. But the research is clear that chlamydia rarely infects the throat and, when it does, rarely is transmitted by oral sex (if ever). Why do so many information sources get it wrong? In my opinion, it is because there are many legitimate parallels between gonorrhea and chlamydia (symptoms, potential complications, etc), which leads people to assume that all aspects are similar. But they aren't. "
Here's a link to the post:
http://www.medhelp.org/posts/STDs/Gonorrhea-Chlamydia-through-oral-sex/show/1257899