Forty-seven tigers, three lions and a panther have died in zoos in south Vietnam due to the bird flu, state media said.

According to the Vietnam News Agency (VNA), the mammals died at the private My Quynh safari park in Long An province and the Vuon Xoai zoo in Dong Nai, near Ho Chi Minh City.

According to test results from the National Centre for Animal Health Diagnosis, the animals died “because of H5N1 type A virus,” VNA said.

The report noted that no zoo staff members were in close contact with the animals that contracted the disease.

FIRST CASE OF HUMAN BIRD FLU DIAGNOSED WITHOUT EXPOSURE TO INFECTED ANIMALS, CDC SAYS

The World Health Organization (WHO) and the Centers for Disease Control and Prevention (CDC) have said that there has been an increase in outbreaks among mammals caused by influenza viruses, including avian influenza A (H5).

In the U.S., a patient in Missouri was diagnosed with bird flu in September.

The patient, who had underlying medical conditions, was successfully treated with antiviral medications at the hospital and has since been discharged, according to the Missouri Department of Health and Senior Services (DHSS).

A cow is shown by an exhibitor at the state fair in West Allis, Wisconsin, U.S., August 9, 2024. Dairy farmers are taking precautions with testing for avian flu while exhibiting cattle during the fair. (Reuters/Jim Vindruska)

This marks the 14th person (in three states) to contract bird flu in the U.S. this year — and the first infection to occur without any reported exposure to sick or infected animals, the CDC alert stated.

The prior 13 cases came after exposure to dairy cows or poultry.

Fox News’ Melissa Rudy contributed to this report.

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Amid reports of a deadly viral outbreak in Central Africa, researchers are reportedly scrambling to develop treatments and vaccines to combat the Marburg virus.

As of Sept. 30, 2024, the country of Rwanda — which is bordered by Uganda, Tanzania, Burundi and the Democratic Republic of the Congo — has reported 27 cases of the virus and nine subsequent deaths, according to the Centers for Disease Control and Prevention (CDC).

Most of the cases have affected health care workers at two health facilities in the city of Kigali, the same source stated.

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The patients are being cared for in hospitals, as noted by the World Health Organization (WHO) on Sept. 29. 

“Contact tracing is underway, with 300 contacts under follow-up,” WHO stated.

This is the first time the Marburg virus has been reported in Rwanda.

What is the Marburg virus? 

Similar to Ebola, Marburg is a “rare but severe hemorrhagic fever” that can cause “serious illness and death,” with a 20% to 90% fatality rate.

There have not been any confirmed cases in the United States, and the CDC says the risk of infection in the country is low.

MARBURG VIRUS ‘WILL NOT BECOME THE NEXT PANDEMIC’ BUT SHOULD BE MONITORED, DOCTOR SAYS

“It is highly fatal in humans and there is no treatment — and unlike Ebola, there is no vaccine,” Dr. Marc Siegel, senior medical analyst for Fox News and clinical professor of medicine at NYU Langone Medical Center, told Fox News Digital.

“It is very similar to Ebola in that it causes hemorrhagic fever,” he added.

Marburg is “difficult to catch,” Siegel noted, as it requires close contact with bodily secretions.

This colorized scanning electron micrograph captured at the NIAID Integrated Research Facility in Fort Detrick, Maryland, shows Marburg virus particles. (Getty Images)

The virus is spread by the Egyptian fruit bat (Egyptian rousette bat), which is found in both Equatorial Guinea and Tanzania, per the CDC. 

An infected human can transmit the disease to other humans through exchange of bodily fluids and contaminated objects.

Marburg is a “rare but severe” hemorrhagic fever with a 20% to 90% fatality rate.

Marburg isn’t new — it was first discovered in 1967, when outbreaks happened in labs in Marburg and Frankfurt (both in Germany) and in Serbia (formerly Belgrade, Yugoslavia).

In 2023, there were outbreaks of the virus in Tanzania (resulting in five deaths) and Equatorial Guineau (12 deaths).

Symptoms, treatment and prevention

Initial signs and symptoms of the virus include fever, chills, a rash with flat and raised bumps, muscle aches, headache, sore throat, chest pain, nausea, vomiting and diarrhea, according to the CDC.

Advanced stages of the disease can be marked by delirium, liver failure, shock, hemorrhagic bleeding and organ failure.

Most of the cases have affected health care workers at two health facilities in the city of Kigali, the CDC stated. (iStock)

Symptoms typically emerge within two to 21 days of infection.

“In fatal cases, death occurs most often between eight and nine days after symptom onset, usually preceded by severe blood loss and shock,” WHO stated in its health alert. 

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There are currently no treatments for Marburg other than “supportive care,” the CDC noted.

Patients should be under the care of a doctor who can monitor oxygen status and blood pressure, provide intravenous fluids, and treat any secondary infections, the agency stated. 

Rest and hydration are also key to recovery.

To prevent outbreaks, the CDC recommends avoiding contact with blood and bodily fluids of sick people and those who have recovered from the virus until tests confirm the complete absence of the virus.

The Marburg virus, first recognized in 1967, causes a severe type of hemorrhagic fever that affects humans and non-human primates. (BSIP/UIG Via Getty Images)

People should also refrain from touching items that may have been contaminated with an infected person’s bodily fluids, the CDC cautioned.

No vaccine is currently available for Marburg, although “some candidate vaccines are currently under development,” according to WHO.

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“There are promising vaccines and therapeutic candidates for MVD, but these must be proven in clinical trials,” the organization added.

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“WHO assesses the risk of this outbreak as very high at the national level, high at the regional level, and low at the global level. Investigations are ongoing to determine the full extent of the outbreak and this risk assessment will be updated as more information is received.”