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Currently, a cold other than whooping cough is also prevalent at the same time. And many people who contract it have sinusitis (acute sinusitis) as a complication.
It is estimated that 80-90% of acute sinusitis is viral in origin. By far the most common of these is the rhinovirus. It is the main causative virus of the common cold. It tends to cause inflammation of the nasal mucosa, causing nasal obstruction and nasal discharge, which can easily spread to the sinuses.
Other viruses include coronaviruses (seasonal), which have been present before the emergence of SARS-CoV-2 as a contributor to the common cold.
Influenza viruses can also complicate sinusitis relatively often after strong systemic symptoms.
Parainfluenza viruses are more common in children, where bronchitis is often the main symptom, but they can also affect the mucous membranes of the nose to sinuses.
Adenoviruses cause a wide variety of symptoms, including nasal discharge, fever and conjunctivitis, but the sinuses may also be inflamed.
However, in some cases with prolonged symptoms, the virus infection may progress to bacterial sinusitis (due to secondary infection by Streptococcus pneumoniae or Haemophilus influenzae).
Incidentally, rhinoviruses often cause bronchitis/ bronchiolitis/ asthmatic bronchitis/ bronchial asthma at the same time as sinusitis and, like whooping cough, are also the cause of persistent cough, so it is often difficult to tell them apart.