Common cold viruses circulating
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Common Cold Viruses: Circulating Types and Prevalence
Rhinoviruses as the Main Cause of the Common Cold
Rhinoviruses are consistently identified as the most common viruses responsible for the common cold in both adults and children, accounting for about half or more of all cases in various studies Mäkelä1998Heikkinen2003Wilson2021+3 MORE. These viruses are highly prevalent and are the leading cause of upper respiratory tract infections, especially during colder months in temperate climates Wilson2021Wat2004.
Other Viruses Frequently Circulating
While rhinoviruses dominate, several other viruses are also regularly detected in people with common cold symptoms. These include:
- Coronaviruses: Strains such as OC43, 229E, NL63, and HKU1 are found in a smaller proportion of cases, typically causing mild upper respiratory infections Mäkelä1998Wilson2021Passioti2014+2 MORE. However, some coronaviruses, like SARS-CoV, MERS-CoV, and SARS-CoV-2, can cause more severe diseases .
- Influenza Viruses: Both influenza A and B can cause cold-like symptoms, though they are less common than rhinoviruses Mäkelä199810.
- Parainfluenza Viruses: These are detected occasionally and are more often associated with respiratory infections in children Mäkelä1998Andrewes196110.
- Adenoviruses and Enteroviruses: These viruses are also found in a minority of cases and can sometimes be present alongside other viruses Mäkelä1998Andrewes196110.
- Respiratory Syncytial Virus (RSV): RSV is more common in children and can cause both upper and lower respiratory tract infections Mäkelä199810.
- Human Bocavirus (HBoV) and Human Metapneumovirus (hMPV): These newer viruses have been identified in recent years, with HBoV found relatively frequently in children, often as a co-infection with other viruses, while hMPV appears to play a minor role Heikkinen200310.
Co-Infections and Virus Interactions
It is common, especially in children, to detect more than one virus at the same time during a cold episode. Co-infections are frequent, with some children carrying up to three or four viruses simultaneously . Studies also show that interactions between viruses can affect how often each virus circulates. For example, influenza activity can temporarily reduce the circulation of other common cold viruses, likely due to immune system responses .
Bacterial Involvement is Rare
Bacterial infections are rarely the primary cause of the common cold. Most cases are viral, and bacterial involvement is usually limited to secondary infections or complications, particularly in children Mäkelä1998Wilson2021.
Ongoing Discovery of New Viruses
Despite advances in diagnostic techniques, a portion of common cold cases still have no identified viral cause, suggesting that additional, as-yet-undiscovered viruses may be circulating Heikkinen2003Passioti2014. The discovery of viruses like human metapneumovirus and new coronaviruses in recent years highlights the evolving landscape of respiratory viruses Heikkinen200310.
Conclusion
Rhinoviruses are the most common viruses circulating and causing the common cold, but coronaviruses, influenza viruses, parainfluenza viruses, adenoviruses, enteroviruses, RSV, HBoV, and hMPV also contribute to the disease, especially in children. Co-infections are frequent, and virus-virus interactions can influence which viruses are most prevalent at any given time. Bacterial causes are rare, and ongoing research continues to uncover new viral agents associated with the common cold Mäkelä1998Heikkinen2003Andrewes1961+6 MORE.
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