key: cord-0772497-9rgtby7a
authors: Kaur, Harsimran; Kanaujia, Rimjhim; Rudramurthy, Shivaprakash M.
title: Rhizopus homothallicus: An emerging pathogen in era of COVID-19 associated mucormycosis
date: 2021-07-12
journal: Indian J Med Microbiol
DOI: 10.1016/j.ijmmb.2021.06.013
sha: 7de049df8e6868363d29c9d476782c3c7fb187eb
doc_id: 772497
cord_uid: 9rgtby7a

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. Lactophenol cotton blue (LCB) mount of R. homothallicus showing broad, aseptate hyphae with numerous golden-brown spiny zygospores with suspensor cells (x100). Inset (x400).

India is facing a huge surge in COVID-19 associated mucormycosis (CAM) cases with a high mortality rate. 1 We report here a very young patient of CAM by a rare pathogen, Rhizopus homothallicus.

A 21-year-old COVID-19 positive female with uncontrolled type 1 diabetes mellitus presented with five days history of progressive rightsided facial pain and swelling. Her fasting blood sugar levels were recorded at 365 mg/dl on admission. She had no history of steroid intake. Clinical examination revealed necrotic lesion in right nasal and palate area. Computed tomography paranasal sinuses (CT-PNS) showed softtissue density in right maxillary and anterior ethmoid sinuses. Diagnostic endoscopic biopsy from the necrotic lesions was performed and subjected to microbiological examination. The potassium hydroxide (KOH) mount from the biopsy revealed presence of broad, aseptate ribbon like hyphae suggesting a diagnosis of rhino-orbital mucormycosis. The patient underwent right-sided maxillectomy with orbital exenteration and was started on insulin for glycemic control and liposomal amphotericin B (3 mg/kg). The post-operative tissue also revealed aseptate hyphae and culture from both pre-operative and post-operative samples grew rapid-growing, floccose, cottony whitish colony turning brownish on Sabouraud dextrose agar (SDA) incubated at 25 C and 37 C. The lactophenol cotton blue (LCB) mount revealed broad, aseptate hyphae with numerous golden-brown spiny zygospores with suspensor cells (Fig. 1) . The isolate was identified as R. homothallicus. The patient is currently improving.

CAM in young patient demands prompt diagnosis and management.

The emergence of R. homothallicus in causing CAM warrants epidemiological investigation.

Multicenter epidemiologic study of coronavirus disease-associated mucormycosis

We greatfully acknowledge Indian Council of Medical Research, New Delhi for extending financial support in this research work vide sanction letter no. MYCO/7/ 2020/ECD-1 dated 21-10-2020.

The authors declare that there are no conflicts of interest.