There's no end in sight for China's Covid lockdowns.

Millions of people across China's locked-down financial hub of Shanghai have been desperately seeking medical care and basic supplies like food. Parents have been forcibly separated from young children infected with Covid-19. And public anger is mounting, with no end in sight as China clamps down.

Since March, China has battled its biggest Covid wave yet, with Shanghai now the largest hotspot. All 25 million residents are under lockdown, with national health care workers and the Chinese military dispatched to boost the city's response.On Tuesday, the country recorded more than 20,000 new cases -- far past the peak of Wuhan in 2020, at the onset of the pandemic.

Though this number is still far lower than in many other countries, it's a dramatic spike for China, which has adhered to a strict zero-Covid strategy that aims to stamp out all outbreaks and chains of transmission using border controls, mass testing, quarantines and stringent lockdowns.