A burning throat can signal a range of conditions, from minor irritations to serious infections—but new research suggests many cases may stem from an overlooked viral trigger that doctors often miss during initial exams.
According to a study published in the Journal of Infectious Diseases, nearly 40% of patients presenting with persistent throat pain tested positive for human metapneumovirus (HMPV), a respiratory virus frequently dismissed as “just a cold.” The findings challenge long-held assumptions about what causes severe throat inflammation, particularly in adults over 50.
Why This Virus Is Likely Overlooked
The study, led by Dr. Elena Vasquez of the National Institute of Respiratory Health in Mexico City, analyzed throat swabs from 237 patients with reported sore throats over a six-month period. While HMPV is known to cause mild respiratory symptoms, the research found it accounted for 15% of all bacterial-negative cases—meaning patients whose strep tests and other common checks came back negative. “We were surprised to see how often HMPV showed up in patients who didn’t fit the typical viral profile,” said Vasquez.
Key Findings
- 40% of patients with persistent throat pain tested positive for HMPV, compared to 28% for rhinovirus and 12% for influenza.
- Patients with HMPV reported more severe pain (average score of 7.2 on a 10-point scale) than those with other viruses.
- Symptoms lasted nearly twice as long (median of 12 days vs. 6 days for other viral causes).
- HMPV was detected year-round, with no seasonal peak—unlike influenza.
How HMPV Differs from Strep or the Flu
Unlike Streptococcus bacteria, which causes strep throat and requires antibiotics, HMPV is a virus. This means antibiotics won’t help, and recovery depends on supportive care like hydration, rest, and over-the-counter pain relievers. “The challenge is that HMPV doesn’t always trigger a high fever or cough, so clinicians may overlook it,” said Dr. Carlos Mendez, an infectious disease specialist at the University of Guadalajara, who reviewed the study.
The study also noted that HMPV infections were more common in adults over 50, a group often assumed to have bacterial or fungal throat issues. “We need to broaden our testing criteria, especially for patients who don’t improve with standard treatments,” Mendez added.
What This Means for Diagnosis and Treatment
Current guidelines from the World Health Organization recommend rapid antigen tests for influenza and respiratory syncytial virus (RSV) in patients with severe symptoms, but HMPV is rarely included. The new data suggests expanding testing panels to cover HMPV, particularly in regions with high viral circulation.
However, experts caution that widespread HMPV testing isn’t yet practical due to cost and lab capacity. “This study highlights a knowledge gap, but it doesn’t mean we should rush to screen everyone,” said Dr. Vasquez. “Right now, the best approach is to treat symptoms and consider HMPV if other causes are ruled out.”
Limitations and What’s Next
The study had several key limitations: it was conducted in a single urban hospital, so results may not apply to rural or pediatric populations. Additionally, the research didn’t track long-term complications, such as whether HMPV throat infections increase the risk of chronic conditions like laryngitis.
Vasquez’s team is now planning a larger, multicenter study to confirm whether HMPV’s role in throat pain holds up in diverse settings. Meanwhile, public health officials are reviewing whether HMPV should be included in future respiratory surveillance programs.
For now, patients with persistent throat pain should seek medical evaluation to rule out bacterial infections—but they can also ask specifically about viral causes like HMPV, especially if symptoms linger beyond a week.
