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According to a civic report on vector-borne diseases issued on Monday, there have been nine deaths and 2,708 dengue cases this season as of November 6, the highest number since the same period in 2017.

In the first week of November, over 1,170 cases were reported.

In a statement issued on Saturday, the Apollo hospital said, “A 49-year-old male has been reported to be one the rare cases of post-dengue mucormycosis by a team of doctors at the hospital.”

The patient had come to the hospital, complaining about a sudden loss of vision in one eye, 15 days after his recovery from the vector-borne disease.

During the second wave of the COVID-19 pandemic earlier this year, a large number of cases of the “black fungus” were reported throughout the country after the coronavirus infection was detected in patients suffering with chronic diabetes.

Mucormycosis or the “black fungus” is more common among people whose immunity has got lowered due to COVID-19, diabetes, kidney disease, liver or cardiac disorders, age-related issues or those on medication for auto-immune diseases like rheumatoid arthritis.

Mucormycosis post dengue is a new observation and hence, patients with a recent history of dengue should remain actively updated about their health and consult a healthcare expert immediately after noticing any new symptoms, doctors at the Apollo hospital said.

Dr Suresh Singh Naruka, senior consultant (ENT), Indraprastha Apollo Hospitals, who is leading the treatment of the patient, said, “A rare case of black fungus (mucormycosis) came into our view when the patient came to the hospital, reporting a sudden loss of vision in one eye post dengue fever. It is rarest of the rare to see mucormycosis as a post-recovery complication in a dengue patient as this condition is generally seen in people who have a history of diabetes, compromised immunity and various other infections.”

“It is a deadly infection caused by a group of fungus called mucor. This fungus invades into the healthy tissues of the nose, sinuses, eyes and brain so rapidly that any delay in diagnosis and management can lead to adverse long-term complications,” he added.

Dengue is accompanied with high fever and therefore, doctors feel that people might suspect that they have contracted COVID-19.

The dengue mosquito larvae breed in clear, standing water, while those of malaria thrive even in dirty water.

Dr Atul Ahuja, senior consultant (ENT and head and neck surgery) at the hospital, said, “Diagnosing and managing a case of rhino-orbital (involving nose and eye) mucormycosis in a patient who has just recovered from dengue fever is very important, as even after best treatment, patients of mucormycosis can lose their eyesight permanently and in a state of an aggressive infection, removal of eye becomes necessary for preventing any further spread of infection.”

Dr Nishant Rana, registrar at the facility, said, “Before coming to the hospital, the patient had an episode of nasal bleeding as a complication owing to dengue 15 days prior to his recovery, wherein he noted a low count of platelets with no transfusion history. Mucormycosis in his case is a resultant factor of compromised immunity owing to dengue.”