Doctors in parts of Massachusetts and Ohio are reporting a spike in child pneumonia cases similar to the outbreak spreading in China and parts of Europe.
In Warren County, just 30 miles outside Cincinnati, there have been 142 pediatric cases of the condition — dubbed 'white lung syndrome' — since August, a figure health officials there described as 'extremely high'.
'Not only is this above the county average, it also meets the Ohio Department of Health definition of an outbreak,' the county's health department said Wednesday.
Meanwhile, in western Massachusetts, physicians are seeing 'a whole lot' of walking pneumonia, a milder form of the lung condition, which is being caused by a mixture of bacterial and viral infections.
Neither outbreak is being caused by a novel pathogen and not all of the pneumonia cases are being caused by the same infection. Experts say a mixture of several seasonal bacterial and viral bugs are hitting at once, putting pressure on hospitals.
It has raised fears that the outbreak that has overwhelmed hospitals China could hit the US this winter. Several European countries are battling similar crises.
But a source at the Centers for Disease Control and Prevention (CDC) told DailyMail.com that, nationally, 'nothing is out of the ordinary' in the data.
Dr Amesh Adalja, an infectious disease expert from Johns Hopkins University in Maryland, told DailyMail.com: 'I would caution against extrapolating one Ohio county to a country of 330million people.'
But he would not be entirely surprised if 'some places in the US are above baseline' this year, as it appears several bacterial and viral infections are rebounding post-Covid.
An 'ongoing investigation' is underway in Ohio into what is triggering the wave of illness.
Patients in the county - which is home to around 200,000 people - have tested positive for mycoplasma pneumoniae, a bacterial lung infection for which some antibiotics are useless, adenovirus, a normally benign respiratory infections, and strep.
The average age of patients is eight, though some are as young as three.
There are several theories, one of which is that children's immunity has been weakened by lockdowns, mask-wearing and school closures during the pandemic — leaving them more vulnerable to seasonal illnesses.
Bacterial respiratory infections usually flare up every five years, normally as people are recovering from a wave of flu or other viral illnesses.
In Massachusetts, doctors say the main issue is RSV, a respiratory virus that kills more than 10,000 Americans each year, mostly young children and the elderly.
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