A Marker of Covid-19 : Loss of sense of smell
There is new evidence for the loss of smell as a symptom of Covid-19 infection . Post- viral anosmia is one of the leading causes of loss of sense of smell in adults, accounting for up to 40% cases of anosmia.
- viruses that give rise to the common cold are well known to cause post infectious loss and over 200 different viruses are known to cause upper respiratory tract Infections . Previously described corona viruses are thought to account for 10-15% cases.
■ How loss of sense of smell could indicate Covid-19 infection?
# Researchers have said corona virus can attach to different types of cell in nasal cavity, which could explain why several patients are reporting a loss of sense of smell.
# Doctors from across the world have reportedly found that a significant number of novel corona virus positive patients loss their sense of smell.
# While the loss of sense of smell is often hard to detect, this may be an early indicator in many Covid-19 patients who are infected. If such patients are isolated at an early stage, the spread of infection from asymptomatic patients could be reduced .
# ENT specialists in the UK , has pointed out that a significant numbers of patients with proven Covid-19 infection from South Korea, China and Italy developed anosmia- a partial or complete loss of sense of smell.
● VIRAL INFECTIONS OFTEN CAUSE LOSS OF SENSE OF SMELL:-
# Viruses that give rise to the common cold are well known to cause post infectious loss and over 200 different viruses are known to cause upper respiratory tract Infections .
# Previously described corona viruses are thought to account for 10-15% cases. It is therefore perhaps no surprise that the novel Covid-19 virus would also cause anosmia in infected patients..
# Respiratory viral infection can cause injury in the specialized nerve tissue leading to the loss of the ability to detect smells.
# Virus attacks supporting cells , not smell related neurons.