New coronavirus infections are accelerating again in Germany just days after its leaders loosened social restrictions, raising concerns that the pandemic could once again slip out of control.
The Robert Koch Institute for disease control said in a daily bulletin the number of people each sick person now infects - known as the reproduction rate, or R - had risen to 1.1. When it goes above 1, it means the number of infections is growing.
Chancellor Angela Merkel, bowing to pressure from leaders of Germany's 16 federal states to restart social life and revive the economy, announced on Wednesday measures that included more shop openings and a gradual return to school.
At the same time, she launched an "emergency brake" to allow for the reimposition of restrictions if infections pick up again.
Karl Lauterbach, a Social Democrat lawmaker and professor of epidemiology, warned that the new coronavirus could start spreading again quickly after seeing large crowds out and about on Saturday in his home city of Cologne.
"It has to be expected that the R rate will go over 1 and we will return to exponential growth," Lauterbach said in a tweet. "The loosening measures were far too poorly prepared."
The Robert Koch Institute said on Sunday the confirmed number of new coronavirus cases had increased by a daily 667 to 169,218, while the daily death toll had risen by 26 to 7,395.
"It is too early to infer whether the number of new infections will continue to decrease as in the past weeks or increase again," the institute said in a separate daily bulletin issued on Saturday evening.
It cautioned that the R figure was subject to statistical uncertainty, adding: "The increase of the reproduction number R necessitates a close monitoring of the situation."
Germany has the sixth-largest COVID-19 caseload in Europe but has managed to contain fatalities from the highly infectious respiratory disease thanks to widespread and early testing and a healthcare system that is well-run and well-funded.
The latest phase of its pandemic management has, say critics, placed too much burden on local authorities to detect and respond to new outbreaks. A threshold set at 50 cases per 100,000 people for reimposing distancing measures is also seen by some epidemiologists as too high.
This level has already been triggered in two districts in the states of North Rhine-Westphalia and Schleswig Holstein, where COVID-19 has broken out among workers at meat processing plants.
The plant in North Rhine-Westphalia was closed on Friday after more than 150 of its 1,200 workers tested positive. Many are migrants from eastern Europe hired by subcontractors and housed in shared quarters that are a potential infection hotbed.
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