Bookings for Covid-19 vaccinations in Hong Kong, especially for the Chinese-made Sinovac jab, have surged significantly on the back of a HK$10.8 million (US$1.4 million) flat lottery and the offer of doses to visitors from across the border. On Friday, more than 10,500 people reserved Sinovac slots - the highest since March 17 - while the 15,100 bookings for the BioNTech jab also marked a strong showing within a three-week span for the.