
City doctors blame ‘long Covid' for severe viral infections that have laid Kolkata low
2
Kolkata: The pandemic may have ended three years ago but it continues to cast its shadow on the city's healthscape.
A past history of 'long or severe' Covid may have led to long-term weakening of respiratory and immune functions, making thousands in the city more vulnerable to recurrent infections, say doctors.
Additionally, rapid weather fluctuations, sudden shifts from high humidity to rain, followed by intense heat combined with elevated levels of air pollution are further weakening the body's natural defences, leading to more frequent and severe infections, they say.
Most private hospitals are now running at 90% occupancy with a majority of the patients suffering from Influenza A and other viral infections.
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At Woodlands Hospital, around 75% of patients currently being treated for influenza and pneumonia are Covid survivors.
"Particularly those who experienced moderate to severe illness have suffered lasting architectural and functional damage in the lungs. When individuals from this group, especially the elderly, come down with flu or pneumonia, their disease tends to be more severe. The risk is further compounded if they have underlying conditions like asthma, COPD, diabetes or a history of smoking," said Dipnarayan Mukherjee, microbiology consultant at the hospital.
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According to Rajdip Sen, consultant physician at BP Poddar Hospital, post-Covid pulmonary complications are making individuals vulnerable to lower respiratory tract infections. "About 30% of influenza and pneumonia patients here have Covid history. In many of these cases, we are observing increased disease severity, particularly among those who had moderate to severe Covid," he said.
Immune dysregulation following Covid may compromise the body's ability to mount an effective defence against common respiratory pathogens, Sen said and added that these patients "often present with a more aggressive clinical course, prolonged hypoxia and delayed recovery, necessitating closer monitoring and in some cases, extended hospitalisation."
Charnock Hospital internal medicine consultant Jayanta Dutta said they, too, are receiving a "significant" number of patients with a history of severe Covid, many of them elderly. "It's possible that the elderly have some residual damage like fibrosis that makes them vulnerable to infections now. We have also seen growth in lung diseases like asthma, upper respiratory tract infections and COPD among those who had long Covid.
This group remains prone to pneumonia and secondary bacterial infections due to lower immunity," he added.
Manipal Hospital Dhakuria has received more than hundred patients with respiratory tract infection over the past 10 days. "Long Covid has left some with lung fibrosis which may have flared up now. Lower resistance induced by Covid and comorbidities could also be a reason in the case of elderly patients. But most severe Covid patients have no trace of lung damage or else this outbreak would have been far worse," said Manipal infectious diseases physician Sayan Chakrabarty.
MS Purkait, medical superintendent, Techno India DAMA Hospital said, "If those with prior history of Covid, especially the elderly, develop influenza or pneumonia within a year of Covid, the symptoms are more serious and may require hospitalization. Sometimes, the infections may co-occur, making the treatment complex and prolonged. We are seeing many such cases now."

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