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A common misconception is that one can "catch a cold" merely through prolonged exposure to cold weather. [95] Although it is now known that colds are viral infections, the prevalence of many such viruses are indeed seasonal, occurring more frequently during cold weather. [96] The reason for the seasonality has not been conclusively determined. [97]
These include respiratory syncytial virus (RSV), rhinovirus, enterovirus, adenovirus, influenza, SARS-CoV-2, or any of the 200-plus viruses that can cause the common cold, per the U.S. Centers for ...
It is a common symptom of allergies or certain viral infections, such as the common cold or COVID-19. It can be a side effect of crying, exposure to cold temperatures, cocaine abuse, [2] or drug withdrawal, such as from methadone or other opioids. [3] Treatment for rhinorrhea may be aimed at reducing symptoms or treating underlying causes.
Fever in the first week of a COVID-19 infection is part of the body's natural immune response; however in severe cases, if the infections develop into a cytokine storm the fever is counterproductive. As of September 2020, little research had focused on relating fever intensity to outcomes.
Trying to self-diagnose a cold, rather than COVID-19, is a "sure fire way to send COVID-19 case rates soaring again," one expert said.
The researchers found that both people who had COVID-19 or another respiratory infection since May 2020 were more likely to have lingering symptoms than people who didn’t have either infection.
If the infection is of bacterial origin, the most common three causative agents are Streptococcus pneumoniae (38%), Haemophilus influenzae (36%), and Moraxella catarrhalis (16%). [38] [39] Until recently, H. influenzae was the most common bacterial agent to cause sinus infections.
Coronavirus diseases are caused by viruses in the coronavirus subfamily, a group of related RNA viruses that cause diseases in mammals and birds. In humans and birds, the group of viruses cause respiratory tract infections that can range from mild to lethal.