For years, global health officials have used billions of drops of an oral vaccine in a remarkably effective campaign aimed at wiping out polio in its last remaining strongholds — typically, poor, politically unstable corners of the world.

Now, in a surprising twist in the decades-long effort to eradicate the virus, authorities in Jerusalem, New York and London have discovered evidence that polio is spreading there.

Nearly half of cancers worldwide can be traced back to a known risk factor, primarily tobacco or alcohol, a huge global study found on Friday, which said that behavioral changes can help reduce the threat of disease.

Troubled by the number of unvaccinated COVID-19 patients showing up at his hospital, the French doctor logged on to Facebook and uploaded a video urging people to get vaccinated.

He was soon swarmed by dozens, then hundreds, then more than 1,000 hateful messages from an anti-vaccine extremist group known as V_V. The group, active in France and Italy, has harassed doctors and public health officials, vandalized government offices and tried to disrupt vaccine clinics.

Dubai International Airport saw a surge in passengers over the first half of 2022 as pandemic restrictions eased and the upcoming FIFA World Cup in Qatar will further boost traffic to the city-state's second airfield, its chief executive said Wednesday.

Paul Griffiths, who oversees the world's busiest airport for international travel, told The Associated Press that the airport handled 160% more traffic over the past six months compared to the same period last year, part of an air travel rebound around the world.

North Korean leader Kim Jong Un has declared victory over COVID-19 and ordered preventive measures eased just three months after acknowledging an outbreak, claiming the country's widely disputed success would be recognized as a global health miracle.

The North's official Korean Central News Agency also reported Thursday that Kim's sister said her brother had suffered a fever and blamed the North Korean outbreak on leaflets flown from across the border from South Korea, while warning of deadly retaliation.

The EU's drug watchdog said Wednesday it aims to approve this autumn a Pfizer/BioNTech Covid vaccine adapted for two fast-spreading subvariants of the Omicron strain.

The BA.4 and BA.5 types are driving a wave of new cases in Europe and the United States, prompting the World Health Organization to warn that the pandemic is nowhere near over.

The capital of China's Hainan province has locked down its residents for 13 hours on Monday as a COVID-19 outbreak grows on the tropical island during the summer school holidays.

The temporary lockdown of Haikou city from 7 a.m. to 8 p.m. follows an ongoing and indefinite lockdown of the beach resort of Sanya since Saturday that is confining vacationers to their hotels for a week. Four other cities and four counties in Hainan also started lockdowns of two days or more on Sunday and Monday.

American drugmaker Pfizer announced a deal on Monday to acquire Global Blood Therapeutics, makers of a recently approved treatment for sickle cell disease, for $5.4 billion.

MPs Najat Aoun Saliba and Melhem Khalaf on Monday held a press conference in parliament to tackle the issue of the long-running blaze at the blast-hit grain silos of Beirut’s port, which has been burning for around a month.

Novak Djokovic has withdrawn from the upcoming hard-court tournament in Montreal because he is not vaccinated against COVID-19 and is therefore not allowed to enter Canada.

By the same reason, as things stand now, he also will not be able to compete in the U.S. Open later this month.