and Co-infection in a Patient with Giant-cell Arteritis.

Unlabelled: Immunosuppressed patients are at greater risk of unusual infections. The authors present the case of a woman with giant-cell arteritis, on oral steroids, who developed cavitating pneumonia due to co-infection with and . Reports of such co-infection are rare in the literature. This case highlights the importance of considering rare pathogens in immunosuppressed patients who present with non-specific symptoms, as well as the impact of such pathogens on clinical management. Another important issue is the need for prophylaxis against spp. in immunocompromised patients.

Learning Points: In patients with vasculitis on systemic corticosteroid therapy or other immunosuppressive treatment, suspicion of uncommon infection should increase in parallel with the cumulative dose of these drugs.Obtaining an accurate diagnosis and early treatment is essential, but can be very challenging.Regular prophylactic therapy should be considered. However, more research is needed to determine whether higher doses of TMP/SMX would provide adequate coverage.