Possible Clues:

• Dangerous fever transmitted by lice
• Dangerous fever marked by the eruption of red spots
• Feverish malady
• Infectious disease transmitted by lice, mites, etc.
• The spy may get very sick of this hut
• So to spy at the hut may be the death of you
• So carrying male chromosome, pressure on to find disease
• Acute, infectious fever
• Disease found in spy hut, strangely
• Bacterial disease