The pandemic spread of COVID-19 raises many questions about
its transmissibility. The initial consensus was that spread was primarily by
contact with a contaminated surface and by inhalation of droplets. However,
airborne transmission is increasingly considered probable. Clarifying COVID-19
transmission is crucial for effective infection prevention and control (IPC)
and healthcare worker (HCW) protection. SARS-C0V-2 is more transmissible than
influenza, with a mean reproductive number of 2.65, even if not as high as other
viruses such as measles. Personal protective equipment (PPE) shortages, IPC
lapses, workload intensity and other factors not yet known, may explain
significant hospital transmission during the early stages of the pandemic in
Ireland and elsewhere.</p