Ebola and Hantavirus: What Clinicians Need to Know About These Deadly Infectious Diseases
核心洞察
Hantavirus (搜索) causes 4–5 confirmed cases annually in Canada, primarily from rodent exposure in agricultural regions, with the Andes strain uniquely capable of person-to-person transmission.
Ebola's current outbreak in the Democratic Republic of Congo involves Bundibugyo ebolavirus (搜索), which carries a 30%–50% fatality rate and has no approved vaccines or antivirals.
Both diseases present with flu-like symptoms including fever, fatigue, and muscle pain, requiring PCR testing for confirmation and rigorous infection prevention protocols.
Two deadly infectious diseases—hantavirus (搜索) and Ebola—have drawn renewed attention from public health authorities, prompting the Canadian Medical Association Journal (CMAJ) to publish concise clinical overviews to aid healthcare professionals in recognition, diagnosis, and management. Both illnesses can present with nonspecific flu-like symptoms yet progress rapidly to life-threatening complications, underscoring the importance of early suspicion and rigorous infection prevention and control (IPAC) measures.
Hantavirus (搜索): Epidemiology and Transmission
Hantavirus (搜索) is a nationally notifiable disease in Canada, with approximately 4 to 5 cases confirmed and reported to public health authorities each year. Most infections occur after exposure to rodents in agricultural areas of Manitoba, Saskatchewan, Alberta, and British Columbia. One strain, the Andes virus (搜索), is unusual among hantaviruses because it can spread from person to person—a feature that has recently placed it in the news.
Clinical Presentation and Diagnosis
Different hantavirus (搜索) strains cause distinct clinical syndromes. In North and South America, strains including the Andes virus (搜索) lead to hantavirus cardiopulmonary syndrome (搜索). In Europe and Asia, hantaviruses are more commonly associated with hemorrhagic fever and kidney dysfunction. The incubation period for both forms is generally 2 to 4 weeks, with common symptoms including fever, headache, muscle aches, and abdominal pain.
Diagnosis is made through serology and polymerase chain reaction (PCR) testing, performed by the National Microbiology Laboratory (搜索) in Winnipeg.
Treatment and Infection Control
There is currently no approved antiviral medication or vaccine specifically for hantavirus (搜索). Treatment therefore focuses on supportive care to manage symptoms and complications. Because of the potential for transmission, suspected Andes virus (搜索) infections require strict infection prevention and control measures: patients should be isolated using airborne, droplet, and contact precautions. Infectious disease specialists should be involved in patient management, and public health authorities must be notified.
Ebola Virus Disease (搜索): Ongoing Outbreaks
Ebola outbreaks have occurred periodically in Central and West Africa since the virus was first identified in 1976. Three major Ebola viruses are known to infect humans, and researchers believe fruit bats serve as the natural reservoir. The virus spreads through direct contact with bodily fluids such as blood, vomit, diarrhea, and sperm, as well as through contaminated objects or surfaces.
The current outbreak in the Democratic Republic of Congo involves Bundibugyo ebolavirus (搜索), which carries a reported fatality rate of 30% to 50%.
Symptoms and Testing
Although Ebola is often associated with bleeding, fewer than half of patients develop hemorrhagic symptoms. Typical presentation includes fever of 38°C or higher, fatigue, muscle pain, and gastrointestinal distress. The incubation period ranges from 2 to 21 days, and diagnosis is confirmed using PCR testing.
People who develop symptoms and have possible exposure risks should be evaluated and tested. This includes travelers who have recently visited countries experiencing Ebola virus disease (搜索) outbreaks, as well as individuals who have had close contact with infected persons or with bats, primates, or game animals from affected regions.
Advances and Gaps in Ebola Treatment
Suspected Ebola cases require rigorous infection prevention and control procedures. Health Canada recommends detailed screening and assessment protocols along with extensive protective equipment, including a fit-tested N95 respirator, face shield, gloves, and fluid-impermeable clothing.
Significant progress has been made in preventing and treating some forms of Ebola. Vaccines targeting Zaire ebolavirus (搜索) have proven highly effective, and two antiviral treatments have reduced mortality rates from 50% to 35%. However, no approved vaccines or medications currently exist to prevent or treat Bundibugyo ebolavirus (搜索). For patients infected with this strain, supportive care remains the primary treatment option—mirroring the therapeutic limitations faced in hantavirus (搜索) management.