Are condoms a hundred percent effective against pelvic inflammatory disease?

No. But that does not mean they are not effective. They greatly reduce the risk.
Nothing is 100% . Condoms are exceedingly effective to prevent std. There are no other options other than abstinence. So they're the best you got to prevent std.

Related Questions

How can my partner and I stop the transmission of pelvic inflammatory disease?

Condoms. While not 100% effective, condoms reduce the risk. The pelvic dam, a rarely used artificial barrier, is even more effective. Read more...
Treat at same time . Treat infections simultaneously. Use condoms. Have regular check ups with gyn. Read more...

Can pelvic inflammatory disease affect a woman's eggs?

If it is bad. It can cause a tubo-ovarian abcess where everrything is infected and then the tube and ovary have to come out, it does not affect the eggs per say, it can also just cause tubal adhesions or tubal blockage so the icvaries are fine but the tubes are ruined so u would need in vitro fertilization, if it is caught early it may not affect fertility at all teh key is early diagnosis and agressive txment. Read more...