Smoke from wildfires in Brazil's Amazon rainforest Wednesday was causing people in the region to cough, burning their throats and reddening their eyes.

Large swaths of the country have been draped in smoke in recent days, resulting from fires raging across the Amazon, Cerrado savannah, Pantanal wetland and the state of Sao Paulo.

Polio vaccines for more than 1 million people have been delivered to Gaza, Israel's military said Sunday, after the first confirmed case of the disease in the territory in a quarter-century.

It was not immediately clear how, or how quickly, the more than 25,000 vials of vaccine would be distributed in Gaza, where ongoing fighting and unrest have challenged humanitarian efforts during more than 10 months of war.

In Lebanon's biggest public hospital, nurses are busy honing their life-saving skills as the specter of all-out war looms, 10 months into intensifying clashes between Hezbollah and Israel over the Gaza war.

"We are in a state of readying for war," nurse Basima Khashfi said as she gave emergency training to young nurses and other staff at the hospital in Beirut.

As fears mount globally about mpox, apparently simple questions such as the danger it poses and differences between variants do not have clear and simple answers.

The Gaza Strip's first recorded polio case in 25 years has health workers and aid agencies grappling with the steep obstacles to conducting mass vaccination in the war-torn Palestinian territory.

Rights groups on Thursday expressed renewed concerns about the humanitarian situation in Gaza after Israel’s latest evacuation orders in parts of the overcrowded central city of Deir al-Balah.

The polio virus has been circulating in the battered Palestinian enclave for the first time in 25 years, relief organization the International Rescue Committee said in a statement. It said the spread resulted from the destruction of hospitals and water infrastructure, along with overcrowded living conditions.

The mpox outbreak is not another Covid-19, the World Health Organization said Tuesday, because much is already known about the virus and the means to control it.

Gaza has recorded its first polio case in 25 years, the Palestinian health ministry said, after U.N. chief Antonio Guterres called for pauses in the Israel-Hamas war to vaccinate hundreds of thousands of children.

U.N. agencies on Friday called for two seven-day breaks in the fighting in Gaza to vaccinate more than 640,000 children against polio, which has been detected in the wastewater.

Swimming has been off-limits in the long-polluted Seine River in Paris for more than a century. So with Olympic swimming events on tap for the river, the city poured in $1.5 billion (1.4 billion euros) to try to clean it up.

With the Paris Games underway, officials are keeping a close eye on water quality. Athletes could feel health effects from swimming in a river with higher-than-accepted levels of E. coli or other bacteria.