They experimented with another type too. Some chemicals that would enhance their own fighters. IIRC they could march something like 90 miles non-stop while under the influence of this drug. Really don’t know about and biowarfare weapons they used.
I don’t believe the Germans used biological warfare in WWII. Here’s an article saying that, except for a single contamination of a resevior with sewage, they didn’t. The Japanese did, though.
According to this site (page 4), strains of Rickettsia prowazeki, R mooseri, hepatitis A and malaria were used by German researchers on prisoners, but no charges were laid.
A offensive biological weapons programme was always feared from Nazi Germany, and led to intensified American and British experiments from the time of the war and afterward, but was never documented during Hitler’s regime.
In fact, it appears the Nazis feared a biological attack upon themselves.