Q fever Mycoplasma pneumoniae:pleomorphic,wall-less bacteria Also called primary atypical pneumonia and walking pneumonia Common in children and young adults Diagnosis by PCR or by IgM antibodies Q fever • Mycoplasma pneumoniae: pleomorphic, wall-less bacteria • Also called primary atypical pneumonia and walking pneumonia • Common in children and young adults • Diagnosis by PCR or by IgM antibodies