A Case vignette of melioidosis pneumonia as Covid mimic: Role of microbiology laboratory in accurate diagnosis

ABSTRACT

Background:During the ongoing COVID19 pandemic period, any new cases of acute-onset respiratory illness are likely to be treated as suspected COVID-19 by default. Methods:A 42year-old lady was admitted with a 4-week history of fever and cough, followed by a 4-days history of increasing short- ness of breath. Fever was intermittent, high grade and was associated with chills and rigor. The patient had a history of uncontrolled type II diabetes mellitus and on admission HbA1C was 15.5%. On examination she had a temperature of 102° F, blood pressure (BP) of 101/67mm Hg, heart rate of 130 beats per minute, respiratory rate (RR) of 24 breaths per minute and O2 saturations of 92% in room air. On respiratory examination, there were crackles in the left infrascapular and infraaxillary area. The patient was admitted in the COVID suspect ward with an impression of moderate COVID-19 infection and nasopharyngeal swab was sent for SARS-CoV-2 on RT-PCR. The patient underwent a CECT scan of thorax, abdomen and pelvis that revealed consolidation in bilateral lung fields with a cavity in lingular lobe with presence of air-fluid level. Mediastinal and hilar lymphadenopathy were present. [Formula presented] Results: SARS-CoV-2 RT-PCR was negative. The patient’s sputum sample revealed pure growth of purple, flat, dry, wrinkled colonies on Ashdown agar after 48 hours which was identified as Burkholderia pseudomallei. The Isolate was susceptible to ceftazidime, mero- penem, co-trimoxazole, amox-clav and chloramphenicol. The patient was started on I.V Meropenem 500mg every 8hourly for 21 days and was discharged on co-trimoxazole tablet. Conclusions: The case definitions of COVID-19 such as fever, cough and shortness of breath can be associated with other infectious etiologies. The role of the microbiology laboratory is thus very crucial in COVID-19 from overshadowing other infec- tious diseases, particularly in endemic areas, hence preventing misdiagnosis and consequent adverse outcomes for patients.