In this section, we study the pathogens of atypical infections united by the absence of a classical cell wall or by obligate intracellular parasitism. You will learn why these microorganisms do not respond to beta-lactams and how they manage to evade the host's immune response for decades.
The material covers three key topics: ornithosis (a zoonotic infection that in microbiology courses often goes hand in hand with other atypical pneumonia pathogens), mycoplasmal pneumonia (respiratory mycoplasmosis), and urogenital mycoplasmoses caused by M. hominis and Ureaplasma spp.
In seminars and exams, instructors most frequently ask about mycoplasma morphology, their unique cultural properties (recall the "fried-egg" colonies), and the differential microbiological diagnosis of atypical pneumonia agents. Pay special attention to pathogenicity mechanisms and the choice of antibacterial drugs—this is a favorite topic for follow-up questions.