Ebola outbreak: Get up to speed with the latest developments

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(CNN) — The news that a U.S. nurse tested positive for Ebola has heightened concerns about the virus. Health officials are moving quickly to increase monitoring of hospital workers treating Ebola and ensure the deadly virus does not spread.

The World Health Organization described it as “unquestionably the most severe acute public health emergency in modern times.”

“I have never seen a health event strike such fear and terror, well beyond the affected countries,” Dr. Margaret Chan, the director-general of WHO, said Monday.

With multiple developments on numerous fronts, here’s what you need to know Monday to quickly get caught up on the latest:

U.S. DEVELOPMENTS

Nurse who treated Duncan is infected:

A Texas Health Presbyterian Hospital nurse who treated Ebola patient Thomas Eric Duncan has tested positive for the disease. Her case marks the first known transmission of Ebola in the U.S. The unidentified nurse had numerous contacts with Duncan, and the CDC thinks there may have been a “breach in protocol” because she wore protective gear. It didn’t say what the breach may be, though. Duncan later died. The nurse is in stable condition.

Cameraman’s condition improves:

Doctors at the Nebraska Medical Center are pleased with the progress NBC cameraman Ashoka Mukpo is making. He contracted Ebola while working in Liberia, and is receiving the experimental drug brincidofovir, or CMX001.

Crew breaks its word:

The NBC crew that had been with Mukpo — and had made an agreement to voluntarily self-confine — apparently broke its word. So, the New Jersey health department issued a mandatory quarantine order to make sure the crew remains confined.

Awaiting Massachusetts patient’s results:

A patient in Massachusetts, who’d been to Liberia, complained of headache and muscle aches. Lab samples have been sent to the CDC for testing. But Beth Israel Deaconess said the patient doesn’t appear to be at high risk for Ebola, and the likelihood the patient has the disease is “extremely low.”

Travel screening begins:

People arriving from the three nations hardest hit by Ebola started getting special screening, including having their temperature taken, at New York’s JFK airport on Saturday. Washington’s Dulles, Newark, Chicago’s O’Hare and Atlanta international airports will begin screening Thursday.

WEST AFRICA DEVELOPMENTS

No relief in sight:

The number of deaths attributed to the current Ebola outbreak has climbed to 4,033, the World Health Organization reported Friday. The tally brings the total number of confirmed, probable and suspected cases of Ebola to 8,399. The numbers were reported from Guinea, Liberia, Nigeria, Senegal, Sierra Leone, Spain and the United States.

IN OTHER COUNTRIES

Spain’s Ebola patient is stable:

Teresa Romero Ramos, a nurse’s assistant in Spain who is the first person to contract Ebola outside Africa, is doing better after taking a turn for the worse last week. “There are signs of hope,” said Dr. Fernando Simon, spokesman for the government’s special committee for Ebola.

CNN’s Dana Ford and Al Goodman contributed to this report.

By Faith Karimi and Dana Ford