Most of these infections are caused by a variety of “cold” viruses. The initial virus infection may be followed by a secondary bacterial infection by organisms such as chlamydia, mycoplasma and streptococcus. Most of these infections are caused by a variety of “cold” viruses. The initial virus infection may be followed by a secondary bacterial infection by organisms such as chlamydia, mycoplasma and streptococcus. A change in weather (particularly, cold air) can cause blood vessels in the nose to constrict.

Source: The Telegraph June 23, 2020 17:48 UTC