Health officials have expressed concern over a simultaneous rise in Delta infections and cases of a respiratory virus known as respiratory syncytial virus, or RSV – a highly contagious, flulike illness that is typically more likely to affect children and older adults.

Cases of RSV have risen gradually since early June, with an even greater spike in the past month, according to data by the Centres for Disease Control and Prevention. RSV, which can cause symptoms that include a runny nose, coughing, sneezing and fever, normally begins to spread in the fall, making this summer spike unusual.

In a series of posts on Twitter, Dr Heather Haq, a pediatrician at Texas Children’s Hospital in Houston, described an increase in both coronavirus and RSV hospitalisations.

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