**Photographers capture the latest from the front lines of the pandemic.**
### Serena Williams, quarantined
Serena Williams’s face is partially obscured by a mask as she practices on a tennis court in Florida, where the state has not issued a face mask mandate. Williams tested positive for the coronavirus last month after playing in the US Open. (Dieu-Nalio Chery/Agence France-Presse — Getty Images)
### Fluctuating mask mandates
An artistic mask dispenser at the Museum of Modern Art in Warsaw encourages museum-goers to wear a mask. Poland, which has recorded 150,000 new COVID-19 cases since the beginning of October, is one of several European countries that recently implemented a nationwide mask mandate. (Krzysztof Bednarski/Agencja Gazeta via Getty Images)
In Dudelange, Luxembourg, a woman applies hand sanitizer near a sign that says “Please wear a mask” at the entrance of a restaurant. Luxembourg, which has vaccinated 78 percent of its population, recently reinstated its indoor mask mandate, along with a mandatory “CovidCheck” system that requires people to show proof of vaccination, recovery from the virus, or a negative test to enter indoor public spaces and some outdoor events. (Etienne Ansotte/NurPhoto via Getty Images)
In Jakarta, Indonesia, a public health worker sprays disinfectant as children pass by on their way to school. On Monday, after reporting its highest daily new case increase since July, Indonesia expanded its mask mandate to include children ages 6 and up. (Tatan Syuflana/Associated Press)
A pedestrian in Paris wears a face mask despite the city’s recent decision to lift its outdoor mask mandate. France has seen a surge in cases in recent weeks, with about 10,000 new cases per day, and health officials are urging the public not to abandon masks altogether. (Gonzalo Fuentes/Reuters)
### Staying six feet apart
A father and his son walk across a bridge in Barcelona, Spain, while maintaining a distance of at least six feet from other pedestrians. Spain has reported more than 4.3 million COVID-19 cases and more than 81,000 deaths. (Lluís Gene/Agence France-Presse — Getty Images)
People keep their distance as they walk along the popular Shibuya Crossing in Tokyo, where cases are steadily rising. Japan has vaccinated about 60 percent of its population.
People sit on socially distanced benches in one of Barcelona’s squares.
Students sit apart from each other during class in Barcelona. (David Ramos/Getty Images)
Students at the University of Barcelona’s Faculty of Economics and Business sit at every other desk, wearing masks. (David Ramos/Getty Images)
People maintain social distancing as they shop in a Barcelona market. (David Ramos/Getty Images)
Pedestrians keep their distance while passing each other on a busy street in Barcelona. (David Ramos/Getty Images)
People stand apart from each other on the departure platform of Gare de Lyon train station in Paris. (Gonzalo Fuentes/Reuters)
Tourists walk along the Colosseum in Rome, wearing masks. (Alessia Pierdomenico/Reuters).
