Virus - Human metapneumovirus (HMPV)

What is Human metapneumovirus infection?

Human metapneumovirus (hMPV) is a common respiratory virus that causes an upper respiratory infection (like a cold). It is a seasonal disease that usually occurs in the winter and early spring, similar to RSV and the flu.

hMPV is most commonly spread from person to person through close contact with someone who is infected via secretions from coughing and sneezing or touching objects such as toys or doorknobs that have the virus on them.

Human metapneumovirus (HMPV) can cause upper and lower respiratory disease in people of all ages, especially among young children, older adults, and people with weakened immune systems. Discovered in 2001, HMPV is in the Pneumoviridae family along with respiratory syncytial virus (RSV). Broader use of molecular diagnostic testing has increased identification and awareness of HMPV as an important cause of upper and lower respiratory infection.

Symptoms

Symptoms commonly associated with HMPV include cough, fever, nasal congestion, and shortness of breath. Clinical symptoms of HMPV infection may progress to bronchitis or pneumonia and are similar to other viruses that cause upper and lower respiratory infections. The estimated incubation period is 3 to 6 days, and the median duration of illness can vary depending upon severity but is similar to other respiratory infections caused by viruses.

Transmission

HMPV is most likely spread from an infected person to others through

• secretions from coughing and sneezing
• close personal contact, such as touching or shaking hands
• touching objects or surfaces that have the viruses on them then touching the mouth, nose, or eyes

Prevention and Treatment

Currently, there is no specific antiviral therapy to treat HMPV and no vaccine to prevent HMPV. Medical care is supportive. However, your patients can help prevent the spread of HMPV and other respiratory viruses by following these steps:

• Wash their hands often with soap and water for at least 20 seconds (see CDC’s Clean Hands Save Lives!).
• Avoid touching their eyes, nose, or mouth with unwashed hands.
• Avoid close contact with people who are sick.

Patients who have cold-like symptoms should

• cover their mouth and nose when coughing and sneezing
• wash their hands frequently and correctly (with soap and water for at least 20 seconds)
• avoid sharing their cups and eating utensils with others
• refrain from kissing others
• stay at home when they are sick

In addition, cleaning possible contaminated surfaces (such as doorknobs and shared toys) may potentially help stop the spread of HMPV

Since HMPV is a recently recognized respiratory virus, healthcare professionals may not routinely consider or test for HMPV. However, healthcare professionals should consider HMPV testing during winter and spring, especially when HMPV is commonly circulating.

Laboratory Diagnosis

Infection with HMPV can be confirmed usually by

• direct detection of viral genome by polymerase chain reaction assays, and
• direct detection of viral antigens in respiratory secretions using immunofluorescence or enzyme immunoassay.

ASHOK KUMAR PATUR