The cautious implementation of the staff vaccination programme by phases reflects the prudent use of the tight supply of vaccines and the priority to protect higher-risk patients. Similarly, the serology blood test kits are also in heavy demand due to the large-scale contact tracing conducted for each confirmed case.

We are fully aware of the concern of our pregnant colleagues who cannot be vaccinated regardless of their immunity status to measles. We are also mindful of the high percentage of false negative results of serology tests, which may arouse undue concern among pregnant staff about their immunity status. Our infection control officers are ready to provide advice and assessment to colleagues in need. As a matter of fact, the officer for the Kowloon central cluster should have contacted Mrs Wong by now to provide her with the necessary support.

Alongside all the risk mitigation measures in place in public hospitals, we have also requested all hospitals to refrain from deploying pregnant staff to work in triage stations (the first encounter) and isolation wards where measles (suspected or confirmed) are managed. Health care employees may consult the infection control officers at their hospital for individual case assessment and advice if necessary.

Once again, I would like to appeal to the public to wear surgical masks in clinical areas and observe hand hygiene during their visits to hospitals. With the upcoming peak travelling seasons, members of the public should also stay vigilant with personal hygiene when they are visiting countries with measles outbreaks.

Dr Vivien Chuang, chief manager (infection, emergency and contingency), Hospital Authority