According to experts and doctors, the H3N2 influenza virus is to blame for the unexpected rise in viral infections and respiratory problems in Delhi and the NCR. Cough, nausea, vomiting, sore throat, fever, body aches, and, in some cases, diarrhea are among the symptoms observed in the patients brought to the hospital. According to doctors, the cough might last up to three weeks even though the fever goes away after three days.

Dr. Amitabh Parti, director of internal medicine at Fortis Memorial Research Institute in Gurugram, noted that more than 40% of viral fever episodes at present are caused by the H3N2 virus. He added that after the acute viral infection subsides in the patient, they might experience spasms, shortness of breath, a chronic dry cough, and heaviness in the chest due to an immunological response in the airways of the lungs.

As the virus can cause issues in people with comorbidities, doctors are advising patients to wear masks to prevent any further viral transmission. Dr. Virender Yadav, Gurugram′s top medical officer, stated that at present there is undoubtedly an increase in viral cases, but that a majority of patients can recover within a week.

According to Dr. Kuldeep Kumar Grover, director of critical care at the CK Birla Hospital in Gurugram, they observe a spike in viral infections during January and February every year. The bulk of people impacted by the infection are under 15 and over 50 years old, and they frequently complain of fever in addition to upper respiratory diseases. 

(Source: https://health.economictimes.indiatimes.com/news/hospitals/h3n2-virus-is-causing-spike-in-flu-cases-in-delhi-ncr-doctors/97937573 )