When it comes to fighting the coronavirus there is no room for any society to be complacent. The prolonged and fluctuating global Covid-19 pandemic makes vaccination a must rather than an option. Hong Kong is only too aware of the importance of such a measure, having staved off community outbreaks for months under the controversial zero-infection strategy. In a renewed attempt to further boost the inoculation rate, government health advisers have suggested lowering the minimum age to three years old for getting the mainland-produced Sinovac jab , from its current level of 18. Currently, 12 is the minimum age for receiving a coronavirus jab, but only with a BioNTech dose. Officials have also been urged to obtain more data to assess whether the German-made vaccine can be extended to children aged five to 11. The proposed extension is not surprising. The government is making an all-out effort to increase the uptake among the elderly; while giving the booster jab to more than 1 million targeted recipients at the same time. The multi-prong approach underlines the determination to inoculate as many people as possible to augment public health protection amid a resurgence in global infections. Sinovac says data shows Covid-19 vaccine is safe for children, babies Understandably, some parents may feel uncomfortable with the idea, especially when the effectiveness of Sinovac jabs among children has yet to be backed up by phase 3 clinical data. But that is not to say there is no basis to further lower the age limit. The mainland began administering vaccines to children aged 12 to 17 in July and further extended it to three to 11 year olds in some regions last month. Central and South American countries are also administering the Chinese vaccine to children as young as three. Figures show that more than 72 per cent of those aged 12 to 19 in Hong Kong have received one dose of the vaccine. There are suggestions the government could help ease concerns by opting for an incremental approach, focusing on giving Sinovac to those aged between 12 and 17 in the initial stage. The city has worked hard to keep the epidemic under control. But with 30 per cent of the population still not having received a jab, it pays to keep exploring ways to widen the coverage.