Table 1.

Correspondence between cluster names and coding rules

Cluster name	Coding rule
General knowledge of COVID-19	corona or virus or information or correct or knowledge or disease or severe illness or pneumonia or risk or symptom
Infection prevention and our hospital’s response	patient or gown or mask or N95 or splash or contact or fever or outpatient or protection or countermeasure or response or material or shortage or hospital or occurrence or medical care or center or staff or nosocomial infection or prevention or method or disinfection or pathway or concentrated or nosocomial
Examination	examination or PCR or positive or negative or antibody
Treatments and vaccines	treatment or vaccine or medicine
Perspective	convergence or finished or time of year or spread
Infection and impact on myself, family, and neighbors	myself or family or child or neighbors or surrounding or influence or living
Impact on the workplace	workplace or bother or work