Much less ink has been spent on the apparently deliberate efforts of resistance forces to spread typhus-carrying lice. I have now come across four items that evidence this.
1) Colonel Leon Mitkiewicz's report dated September 7, 1943.
According to this report, the Polish Secret Army had successfully taken the lives of "a few hundred" German occupiers using "typhoid fever microbes and typhoid fever lice", obviously meaning typhus.

For more on this item, see Germar Rudolf's article:
https://codoh.com/library/document/aspe ... ld-war-ii/
2) Witold Pilecki's extended report on Auschwitz.
According to this Polish resistance leader who escaped from Auschwitz in 1943, they grew typhus-infected lice and deliberately set them on the SS, ultimately killing them.
The Bolsheviks left louses and terrible Siberian typhus, from which our colleagues began to suffer in mass. The typhus took the camp and was making a huge devastation. The authorities rubbed their hands, quietly contemplating that ally in doing prisoners away. Then we began, in HKB laboratory, to rear typhus louses and to set them free upon overcoats of SS-men, during each report and inspections of our blocks.
https://archive.org/details/WITOLDREPOR ... 2/mode/1up
3) Dr. Walter Dötzer's Disinfection, Decontamination and Disinfestation.Who went for typhus, he returned rarely. But also our little, bred louses were doing their job and typhus broke up also in the barracks of SS-men and an epidemic grew up. Doctors could hardly cope with Siberian typhus, but organisms of SS-men also. The ranks of SS-men suffered more and more losses. They were sent to the hospital in Katowice, where SS-men died in most cases.
https://archive.org/details/WITOLDREPOR ... 1/mode/1up
This SS textbook from 1943 includes a warning about "sabotage" of delousing procedures in the East. From page 108:
Translated to English:Kurze Zusammenstellung der häufigsten Fehlerquellen bei Entlausungen
[...]
5. Unvollständige Sachenentlausung durch Verbergen oder Verstecken von Kleidungsstücken. (Furcht vor Beschädigung der Kleidung!) *)
*) Bei Entlausung von Zivilpersonen in den besetzten Ostgebieten ist auf Sabotage zu achten, ferner wird das Fehlen von Läusen in diesen Gebieten oft als gesundheitsschädlich angesehen und eine vollständige Entlausung mit allen Mitteln zu verhindern versucht.
Information on this book including a scan has been kindly provided by Scott in this post:Brief summary of the most common sources of error in delousing procedures
[...]
5. Incomplete delousing of belongings due to concealment or hiding of clothing. (Fear of damaging the clothing!) *)
*) When delousing civilians in the occupied Eastern territories, sabotage must be anticipated; furthermore, the absence of lice in these areas is often considered detrimental to health, and attempts are made to prevent complete delousing by all means.
https://codohforum.com/viewtopic.php?p=7464#p7464
4) The Alfred Franke-Gricksch Report.
On May 4, 1943, Franke-Gricksch visited Auschwitz and wrote a report not long after. According to him, Jewish prisoners would try to protect "their lice" during delousing procedures.
See this encyclopedia entry for a longer explanation on what the report is:It is a very difficult task to cope with the individual groups of prisoners. The gypsies have to be treated differently from Poles, and the Poles differently from the Ukranians. The hygiene question is a very heavy responsibility for the Administration, nearly all the inmates, especially the jews from the East and South-East have to be trained in this respect for they show a particular fear of keeping themselves clean. In parts there have to be very strict measures in order to train the prisoners out of superstition. When having a shower bath they wrap up their lice in a piece of paper and hide it in their mouth in order to have them in their new clothes as they are of the opinion that whoever has lice will not become ill.
https://holocaustencyclopedia.com/witne ... lfred/292/
Here is a link to an English translation of the report:
https://www.holocausthistoricalsociety. ... eport.html
Conclusion
These four items, all from 1943 -- which is possibly the peak year for typhus fatalities in Poland -- give substantial reason to believe typhus was used as a weapon by anti-German groups. In an article linked above, Rudolf mentioned that the Soviets, too, had been considering typhus as a weapon, but further evidence of that usage had not been found. I would be interested to know if anyone else has come across evidence of this kind.
An argument could be made that Franke-Gricksch and to a lesser extent Dötzer described the culprits as acting out of "superstition", meaning they protected the lice without ill intent, but it strikes me that this may only have been a convenient excuse by saboteurs who did have ill intent. In any case, the result is the same. People died of typhus because some of their own chose to resist and frustrate the Germans' efforts to delouse them.

