Recognize Human Metapneumovirus (hMPV): What are the Sign and Symptoms
Introduction
Human
Metapneumovirus (HMPV)
was first identified in 2001 by Bernadette G. van den Hoogen and her colleagues
in the Netherlands. hMPV is a negative sense single-stranded non segmented RNA
(-ssRNA) respiratory infection-causing virus. It is a lesser known but an impactful
respiratory virus that affects the upper and lower respiratory tracts including
the lungs.
Human
metapneumovirus (hMPV) usually causes a wide range of symptoms ranging from
mild to acute. Mild or moderate symptoms often resemble other respiratory
infections such as the common cold or influenza and often overshaded by them.
Usually, the infected person recovers within a week with proper rest and
hydration. On the other hand, in the case of severe conditions, acute symptoms
can lead to serious complications, especially in vulnerable groups such as
infants, older people, and immunocompromised individuals. The description of
mild and acute symptoms is as follows:
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| Flow Chart Showing Human metapneumovirus (hMPV) symptoms |
Common Sign and Symptoms of hMPV: Mild or Moderate Symptoms
A. Upper Respiratory Symptoms
· Runny or stuffy nose:
Tt The infected person may have symptoms
of a runny or stuffy nose, similar to a common cold.
· Sore throat:
Tt The infected person may feel mild discomfort while swallowing.
· Persistent Cough (Dry or Productive):
T The infected person may have a cough. It may be dry or productive, but not severe.
· Sneezing:
T The infected person may suffer from sudden involuntary expulsion of air from the nose and mouth due to hMPV.
 |
| Upper and Lower Respiratory Tract Infection Human Metapneumovirus (hMPV) |
B. Lower Respiratory Symptoms
· Wheezing:
A A loud whistling sound while breathing
· Shortness of breath:
Difficulty
breathing or feeling of choking.
· Chest Congestion:
Infected
person may feel congestion in chest due to persistent and intense cough
· Rapid breathing (tachypnea):
An
increase in the breathing rate.
· Retraction:
The chest muscles
appear to stretch when breathing.
C. General Symptoms
· Mild fever to high Fever:
A
slight or high increase in body temperature has also been observed in some
infected individuals depending upon severity of infection.
· Fatigue or Muscle aches:
The
infected person may feel tired or have low energy.
· General malaise:
D. Severe Symptoms of hMPV
Bronchiolitis:
Inflammation of the small airways in the lungs.
Pneumonia:
Infection causing inflammation of the air sacs in the lungs.Acute Respiratory Distress Syndrome (ARDS):
E. Causes of Severe hMPV Infection
There
are several factors that turn a mild hMPV infection into an acute stage. The
severity of infection depends on a combination of factors such as the person's
age, immune status and underlying health conditions, as well as characteristics
such as environmental exposure and stress and viral load.
·
Age
and Health Status
First
are host-related factors such as age and health status prior to infection.
Acute symptoms are more likely to develop in people who are vulnerable due to
age (infants or elderly people) or chronic illness (especially
immunocompromised individuals suffering from chronic lung disease or
cardiovascular problems).
·
Viral
Load
High
viral load (the amount of virus a person is exposed to) and the infecting viral
strain are also factors that cause acute infection.
·
Co-infection
of Other Virus
If
a person is infected with hMPV along with another virus (such as RSV, influenza
or coronavirus), the combined effect can make the disease more severe.
Co-infection can lead to more significant inflammation in the airways and
complications such as pneumonia or respiratory failure.
·
Late
Detection of hMPV
Sometime
late detection of hMPV and inadequate medical intervention can lead to acute
stage infection.
·
Environmental
Factors and hMPV
In
crowded environments such as daycare centers, schools, and nursing homes, a
person may be exposed to a higher viral load, resulting in a more severe
infection. In severe cases of HMPV infection, particularly in young children,
older individuals, or people with weakened immune systems, a person's health
may progress to more serious respiratory illnesses such as bronchiolitis,
pneumonia, and ARDS.
The impact of
human metapneumovirus (hMPV) infection depends on the person's age and health
condition.
F. Symptoms and Impact of hMPV on Infants and Young Children
Infants
and young children have mild symptoms if the infection is mild, such as mild
fever, nasal congestion, runny nose and cough. But in case of severe infection,
children, especially infants, may develop wheezing, difficulty breathing, rapid
breathing (tachypnea), retractions (tightening of the chest muscles),
bronchiolitis or pneumonia and may require hospitalisation and intensive care.
G. Symptoms and Impact of hMPV on Healthy Young Adults
Mild
or moderate infections cause common symptoms like sore throat, cough, nasal
congestion and mild fever in healthy young adults and they recover with
complete rest and drinking water, in rare cases medication is required. If the
symptoms are severe like high fever or fatigue, it is necessary to take proper
medication.
H. Symptoms and Impact of hMPV on Older and Immunocompromised Individuals
Mild
infections in elderly and immunocompromised individuals may present with
symptoms such as shortness of breath, high fever, wheezing and coughing.
However, in case of severe infections, symptoms such as pneumonia,
bronchiolitis, ARDS and exacerbation of chronic conditions such as heart
disease or lung disease can make the condition more severe. In
immunocompromised and comorbid individuals, the severity of symptoms increases
to a prolonged illness, severe lower respiratory tract infection, secondary bacterial
infection, complications such as pneumonia and exacerbation of pre-existing
conditions.
 |
| High Risk Group of Human Metapneumovirus (hMPV) |
Survival Period of hMPV Outside the Host Body
Being an enveloped hMPV it is relatively fragile compared to non-enveloped viruses. It can only survive outside the host cell as respiratory droplets i.e. in open environments. It can survive on surfaces for several hours or a limited period. Its survival depends on various factors such as temperature, humidity and type of surface. It degrades quickly in hot and dry environments. Frequent hand washing and disinfecting surfaces are effective measures to reduce the risk of transmission. hMPV is an enveloped virus, which means it is relatively fragile compared to non-enveloped viruses. Outside the human body, the virus is generally not very stable and can survive for a limited time. It can survive on surfaces for hours to days depending on environmental conditions such as temperature and humidity. In general, viruses such as hMPV are most stable in cool, moist environments
Incubation Period of hMPV
The
incubation period of any pathogen, including viruses, is the time between
exposure of any healthy person to the pathogen and the onset of symptoms in
that person. Incubation of hMPV typically ranges from 3 to 6 days. During this
period, the virus actively replicates itself within the host's respiratory
tract.
Conclusion
The
mildness and severity of hMPV infection depend on a combination of factors such
as the person's age, immune status, and underlying health conditions, as well
as environmental exposures and viral characteristics such as strain and viral
load. Acute symptoms are more likely to develop in people who are vulnerable
due to age or chronic illness, or if the virus is particularly aggressive. Awareness
campaigns about the signs and symptoms of hMPV enable us to take immediate
action and reduce its spread. By practicing good hygiene and being vigilant,
you can protect yourself and your loved ones from this hidden respiratory
virus.
Disclaimer
The
information provided in this blog post on the signs and symptoms of HMPV (human
metapneumovirus) infection is for informational purposes only. It is not
intended to provide diagnosis, treatment or medical advice. Always consult a
healthcare professional for proper diagnosis and treatment. The content is
based on current research and resources available at the time of writing, but
may not reflect the latest medical developments.
Frequently Asked Questions (FAQ)
Is human metapneumovirus just a cold?
Not exactly. Though most of symptoms of Human metapneumovirus are similar to a cold, but some people can get very sick. First time infection of hMPV may sometime severe in vulnerable section of population such as infants, young children under age 14 years elders and immunocompromised people. Just like other viral infections you developed immunity from your first infection and then you are more likely to have mild, cold-like symptoms if you get another HMPV infection.
Is human metapneumovirus the same as RSV?
No, the two are not the same, but human metapneumovirus is very similar to RSV (respiratory syncytial virus). It belongs to the same Pneumoviridae family as RSV and can cause similar symptoms. The peak age for severe illness from hMPV is between 6 and 12 months, but RSV is more likely to cause severe illness in infants younger than 6 months.
Is Human metapneumovirus (hMPV)virus Contagious?
Yes, HMPV virus is contagious. It can be transmitted when a person come in direct contact with infected person via hugging, hand shake and kissing etc.
What is Human metapneumovirus (hMPV) duration of illness?
The hMPV infection lasts for two to seven days depending on the severity of infection like other mild respiratory virus infection. However, HMPV takes three to six days to show its symptoms from the day of person exposure to virus. In case of severe infection, it may take longer time to recover from infection.
Can you get hMPV twice?
Yes, you can get it more than once as the virus is highly mutable, but symptoms are typically milder after your first attack with it.
Is Human Metapneumovirus (hMPV) occurs in babies?
Yes. It occurs in babies. The primarily infect the infant up to 6 or 8 months and young children up to the age of 14 years
Can Human Metapneumovirus hMPV virus cause sinus infection?
hMPV is a respiratory virus that causes infect the upper and lower respiratory system that can leads to respiratory illness in persons all age groups. No case of sinus infection by HMPV reported yet.
What are Human Metapneumovirus (hMPV)virus symptoms in adults?
In adults, symptoms of human metapneumovirus (hMPV) are often cold or flu-like. The most common mild to moderate respiratory symptoms are cough, nasal congestion, sore throat and fever which usually resolve within 1-2 weeks. Lower respiratory tract infections may cause shortness of breath, wheezing or hoarseness. In severe cases, especially in older adults or immunocompromised individuals, it can cause bronchitis, pneumonia or exacerbate existing lung conditions. Since the symptoms overlap with other respiratory viruses such as RSV or influenza, proper diagnosis is required. If difficulty in breathing or high fever persists, it is advisable to seek medical care.
What are Human Metapneumovirus (hMPV)virus symptoms in children?
Human metapneumovirus (hMPV) in children causes common cold-like respiratory symptoms such as cough, runny nose, fever and nasal congestion. If the infection moves to the lower respiratory tract, it can cause wheezing, fast or difficult breathing and shortness of breath. In severe cases, it can exacerbate bronchiolitis, pneumonia or asthma. Infants and young children are particularly vulnerable, sometimes experiencing lethargy, poor feeding or irritability. Ear infections (otitis media) can occur. Although symptoms are mild in most cases, high fever or shortness of breath requires medical attention. If properly cared for, patients usually recover within 1-2 weeks.
How long does hMPV last?
Symptoms usually resolve within 7–14 days. Coughing may linger for weeks, especially in children.
Can adults get hMPV?
Absolutely. While children under 5 are most affected, adults over 65 or with weakened immunity are at higher risk for complications.
Is there a vaccine for hMPV?
No vaccine exists yet for hMPV, but research is ongoing. Prevention relies on hygiene and avoiding exposure to virus.
When should I see a doctor if infected by hMPV?
Seek doctor advise if symptoms worsen like breathing becomes laboured or fever exceeds 103°F (39.4°C).
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