The Marburg Outbreak, How Different is it from Ebola?

Marburg fever, or Marburg hemorrhagic fever, is an acute febrile infectious disease caused by infection with the 'Marburg virus', a type of RNA virus. It is known to appear mainly in the African continent, starting with the first laboratory infection case in Germany in 1967, and including South Africa, Kenya, the Democratic Republic of the Congo, Angola, and Uganda. It is known that the fruit bat (Rousettus aegyptiacus) is the most likely natural host, but cases through person-to-person contact or laboratory safety accidents directly affect the incidence and mortality rate of Marburg fever. Since the general symptoms are very similar to other hemorrhagic diseases, especially Ebola virus and malaria, it is difficult to clinically distinguish them, so laboratory diagnostic tests are essential.

What is the Marburg Virus?
Contagiousness and Infection Mechanisms of the Marburg Virus
Diagnostic Methodologies between Marburg and Ebola
Is Marburg More Fatal?
Practical Tips for Personal Protection Against Viral Infections

What is the Marburg Virus?

Marburg virus (MARV) is a highly contagious virus that causes Marburg virus disease (MVD), a severe hemorrhagic illness in humans. It is closely related to Ebola virus, and both belong to the Filovirus family. Marburg virus is named after the German city of 'Marburg', where it was first identified in 1967 after an outbreak involving infected monkeys in Uganda. 

It can also spread from person to person through contact with the body fluids (blood, saliva, urine) of infected individuals or animals, especially bats and non-human primates. Marburg hemorrhagic fever begins with high fever, headache, and muscle aches, and progresses to more severe symptoms, such as vomiting, diarrhea, and abdominal pain. Uncontrolled severe hemorrhagic symptoms can occur within a week. The disease has a high mortality rate, with an average mortality rate of about 50%. Because of its high mortality rate and potential for global transmission, Marburg virus is classified by the World Health Organization as a high priority pathogen for research and surveillance. There is no specific treatment or vaccine, but supportive care such as hydration and symptom management can increase the chances of survival.

Contagiousness and Infection Mechanisms of the Marburg Virus

Marburg virus is highly contagious, but it is transmitted primarily through specific modes of transmission, so close contact in healthcare and community settings is a cause for concern. Here is an overview of the transmission and infection mechanisms

Transmission:

Human-to-human transmission occurs through direct contact with an infected person’s body fluids, such as blood, saliva, vomit, urine, feces, sweat, breast milk, and semen. It can also spread through exposure to surfaces, clothing, or bedding contaminated with infectious body fluids. In healthcare settings, the virus is at high risk for transmission to healthcare workers who do not have adequate personal protective equipment (PPE). Transmission from animals to humans can also occur through contact with infected nonhuman primates or their body fluids, and long-term exposure to caves or mines inhabited by infected bats can lead to infection with the virus.

Infection Mechanism:

Exposure to the virus occurs through the body’s mucosal surfaces (e.g., eyes, nose, or mouth). Marburg virus specifically targets and infects cells in the liver and other organs. It also has mechanisms to evade the immune system, delaying the immune response and enabling rapid replication. Infected cells release large quantities of virus particles, causing widespread infection and organ damage. The virus damages the endothelial cells lining blood vessels, increasing permeability and causing bleeding, which can lead to organ failure, shock, vascular disease, neurological disease, and death.

Diagnostic Methodologies between Marburg and Ebola

The diagnostic methods for Marburg and Ebola viruses are very similar, as both belong to the filovirus family and cause similar symptoms. Marburg and Ebola both cause similar symptoms, including high fever, headache, muscle pain, vomiting, and bleeding. Early symptoms can overlap with other diseases such as malaria, typhoid, and leptospirosis, so laboratory confirmation is important for an accurate diagnosis. The diagnosis is made by isolating the virus from the blood or body fluids of a suspected patient by various methods, or by performing genetic testing on the virus.

The diagnostic platforms for Marburg and Ebola are similar, but rely on specific primers or antibodies that target unique genetic markers or protein structures of each virus. Some advanced multiplex PCR tests can simultaneously screen for Marburg, Ebola, and other hemorrhagic fever viruses, allowing for faster identification during an outbreak. The most suitable method for diagnosing Marburg virus is direct detection of viral ribonucleic acid using nucleic acid amplification tests (NAATs).

Is Marburg More Fatal?

Both Marburg and Ebola viruses cause severe, often fatal, hemorrhagic disease,

Although both diseases have high mortality rates, this can vary due to factors such as the strain of the virus, availability of health care, and timing of intervention. Marburg is considered slightly more lethal than Ebola. The mortality rate for Marburg virus ranges from 24% to 88%, depending on the outbreak and treatment. The overall mortality rate was about 80%, comparable to Ebola and the highest of any viral disease except rabies. The mortality rate for Ebola generally ranges from 25% to 90%, depending on the outbreak. The average mortality rate for an outbreak is about 50%.

Both Marburg and Ebola viruses cause rapid, severe disease progression, with symptoms such as severe bleeding, shock, and organ failure. Due to their high mortality rates and the lack of specific antiviral treatments and vaccines (although there have been recent advances against Ebola), both viruses remain public health priorities due to their potential to cause large outbreaks and high death tolls. In summary, Marburg virus is generally considered to be as lethal as Ebola virus, with the actual mortality rate varying depending on the specific circumstances of each outbreak.

Practical Tips for Personal Protection Against Viral Infections

Personal protection against viral infections, especially those transmitted through bodily fluids or close contact, requires a combination of hygiene practices, personal protective equipment (PPE), and careful behavior. Here are some practical tips to help minimize your risk of viral infection:

Hygiene practices: Wash your hands regularly with soap and water for at least 20 seconds before eating, after using the toilet, and after being in public places. If soap and water are not available, use hand sanitizer. Avoid touching your eyes, nose, and mouth with unwashed hands, as viruses can enter your body through these areas.

Social distancing: Maintain a safe distance from people who are coughing or sneezing, and avoid crowded places during an outbreak. Avoid visiting areas with known outbreaks or cases of viral infections, especially those with high-risk animal viruses.

Personal protective equipment: Wear a mask in areas with high transmission rates or when around people who may be sick. Use disinfectant wipes and disposable gloves when in direct contact with potentially contaminated surfaces, bodily fluids, or people who are sick. In high-risk settings, such as hospitals handling bleeding patients, full PPE, including gowns, gloves, and face shields, should be worn.

Stay informed: Stay informed with up-to-date information from trusted sources, such as the World Health Organization (WHO) and local health authorities. If you develop symptoms of a viral infection, seek medical care immediately and follow public health guidance to help reduce the potential spread.

Strengthen your immune system: Eat a balanced diet, drink plenty of fluids, and exercise regularly to strengthen your immune system. Get 7 to 9 hours of quality sleep to support immune function and recovery.

Vaccinations: Stay up-to-date on recommended vaccines for diseases such as flu, COVID-19, or viruses for which there are vaccines. Avoid visiting areas with known outbreaks or cases of viral infections, especially those with high-risk animal viruses.

Source:

1. Marburg virus disease

https://www.who.int/news-room/fact-sheets/detail/marburg-virus-disease

2. China CDC issues health advisory on Marburg virus disease

https://www.globaltimes.cn/page/202411/1322618.shtml

3.Marburg Infections

https://www.merckmanuals.com/professional/infectious-diseases/arboviruses-arenaviridae-and-filoviridae/marburg-and-ebola-virus-infections

4. Rwanda's Marburg virus outbreak is seeing an unusually low fatality rate

https://www.kasu.org/2024-11-03/rwandas-marburg-virus-outbreak-is-seeing-an-unusually-low-fatality-rate

5. Marburg virus: What Canadians need to know after fears spread in Germany

https://globalnews.ca/news/10792090/marburg-virus-germany-health-scare-canada-risk/