BEIJING (BLOOMBERG) - China has been able to beat back successive waves of Covid-19 thanks to the widespread deployment of snap lockdowns, strict quarantines and some of the world's tightest border controls. Yet, the strain is showing at its borders.
Case in point is Ruili, a city in remote south-western China that is hemmed in by a 169km border with Myanmar on three sides.
The city, which thrives on cross-border trade, has sent its 268,000 people into lockdown four times in the past seven months alone. Retailers and restaurants have gone out of business.
Locals are largely barred from leaving, and the area is languishing amid restrictions designed to find and extinguish as they spill across the national border and spread.
The toll on its people and economy has been so severe - with little payoff in terms of eliminating the pathogen - that some are speaking out.
"Extended lockdowns have sent the city into an impasse," said Mr Dai Rongli, Ruili's former deputy mayor, making an emotional plea on his personal social media account on Thursday (Oct 28).
"It urgently needs to resume production and essential businesses. The government should learn its lessons in balancing the big picture with the local situation as well as people's livelihoods and Covid-19 control."
The rare outburst - in a country where most people acquiesce to the government and local leaders have been removed for failing to control the virus - underscores the toll being extracted by China's approach almost two years into the pandemic.
Beijing has held fast to the strategy - which relies on constant vigilance and wiping out all traces of the virus - even as the pressure to protect jobs, mental health and economic growth forced other so-called Covid Zero countries from Singapore to Australia to open up.
The sacrifices made by residents of Ruili have done little to keep the virus at bay, as successive waves of Covid-19 hit one after another since March. There have been more than 1,500 cases so far this year in the broader Yunnan province, with most in the Ruili region.
The problem is Myanmar, where the virus is rife due to containment challenges amid political turmoil. "Every lockdown is a severe emotional and material loss," said Mr Dai, who is now a senior executive at a state-owned rail construction firm.
"Every battle against Covid-19 adds a layer of unhappiness. Officials endured hardships while standing guard on the border. Ordinary people deplete their means and passively accept the reality every time an outbreak strikes."
Mr Dai's comments struck a chord on Chinese social media, where many people expressed empathy with Ruili's predicament.
Despite the burden on citizens, the world's No. 2 economy remains committed to keeping coronavirus out, at least through the Winter Olympics that begin in Beijing in February.
That stance is being tested by increasing points of friction, including fatigue with the stringent rules. The police in Beijing have launched criminal investigations into people who flout virus curbs, while elderly tourists have ignored inconclusive tests and hidden fevers to continue travelling and entertaining.
This behaviour, in groups that are at higher risk from Covid-19, have contributed to its spread. The arrival of the more infectious Delta variant is also making it easier for the pathogen to slip between the emerging cracks of China's Covid-19 defences.
The quandary in Ruili, home to Burmese nationals, local Han Chinese and other ethnic groups, is a harbinger of the limits of Covid Zero. The Dehong Prefecture that includes Ruili had 97 per cent of its people fully vaccinated by July.
China's pandemic strategy has seen success compared to many other parts of the world, though its measures are not easily replicated. Masks are compulsory in public places, mass testing of entire neighbourhoods is deployed within hours of a reported infection, and the country's surveillance network facilitates detailed contact tracing.
While more than 75 per cent of the population is vaccinated, there are mandatory quarantines on entry, some as long as 21 days.
But still, Delta has been able to get in. The country is currently battling its fourth flare-up driven by the variant in the past five months, with each outbreak returning more quickly than the previous one.
While the case numbers are minor compared to what other countries are living with ever day, the response is not. The recent outbreaks have raised the question of how long China can sustain its no-compromises elimination strategy, and at what cost.
"People in Ruili have done their best," Dr Zhang Wenhong, a renowned infectious disease specialist in Shanghai who has insinuated that China might also need to find a way to coexist with the virus. "It's not just Ruili, but tens of thousands of place like it. China has to open, the world has to open. Is there any better shield than our own body?"