Posted by The B Word on the Military forum:-
Typhoon's Eurojet EJ200 has a 0.4:1 bypass ratio
Boeing 737's CFM-56 has a 5:1 to 6:1 bypass ratio (depending on the variant)
Tristar/B747's RB-211 has a 4:1 to 5:1 bypass ratio (depending on the variant)
Both can be damaged by contimination (such as sand, ice and ASH!), but the low-bypass-ratio EJ200 is far more likely to suffer damage over the high-bypass-ratio RB211 or CFM-56.
The F404s fitted to the F-18C/Ds of the Finnish Air Force (that were also damaged recently) has an even lower bypass-ratio of 0.34:1