By Martin Quin Pollard and Eduardo Baptista BEIJING/SHANGHAI (Reuters) -When Chinese businesswoman Yang Jing was planning this year’s summer holiday in 2021, she chose the tropical southern island of Hainan because of its nigh-perfect COVID track record. The island in the South China Sea recorded just two positive symptomatic COVID-19 cases in the whole of last year. Fast forward to this month, however, and the number of cases has suddenly soared, prompting a lockdown in the city of Sanya and leaving tens of thousands of tourists like Yang stuck on the island. Sanya, the island’s main tourist …
