A reader’s letter to this newspaper alerted Singaporeans to the fact that the Government has mandated that an individual’s fully vaccinated status expires 365 plus 14 days after the second dose. The writer argued that this rule must surely be a matter of public interest. It indeed has implications for all Singapore residents, given that there is also a policy of vaccination-differentiated measures and that the long-term effects of yet more jabs against Covid-19 are unknown. Responding on the issue, which became a talking point, the Ministry of Health (MOH) said that the validity period during which residents will be considered “fully vaccinated” after their last Covid-19 jab will be reviewed as more data becomes available. The ministry also regularly reviews evidence from studies here and abroad on the protection provided by Covid-19 vaccines.