Q: Why is Madagascar the current plague epicentre?

Madagascar has had endemic plague since the 19th century — originally introduced through the port of Toamasina. Plague enzootic cycles maintain Y. pestis in the highland rodent populations. Several factors drive Madagascar's ongoing burden: endemic rat populations; flea infestation of homes; poor housing; limited access to rapid diagnosis and antibiotics in remote highlands; and seasonal plague epidemics (August-November when flea activity peaks). The 2017 Madagascar pneumonic plague outbreak (approximately 2,000 cases, 200+ deaths — the worst in 50 years) demonstrated the potential for rapid urban spread.

Q: How is plague treated?

Plague is highly treatable if diagnosed early. First-line: gentamicin IV/IM (now preferred) or streptomycin IM — for 10 days. Alternatives: doxycycline or ciprofloxacin (oral or IV). Duration: 10-14 days. Pneumonic plague patients require strict isolation (respiratory precautions) and immediate antibiotic initiation — delay beyond hours dramatically increases mortality. Post-exposure prophylaxis (for contacts of pneumonic plague): 7-day course of doxycycline or ciprofloxacin. Supportive care: IV fluids, vasopressors for septic shock.

Q: Can plague spread from person to person?

Yes — pneumonic plague (lung infection) spreads efficiently through respiratory droplets over short distances. Bubonic and septicaemic plague do NOT spread person-to-person (require flea bites or direct blood/body fluid contact). When pneumonic plague cases are identified, rapid contact tracing, isolation of cases and post-exposure prophylaxis of contacts are essential to prevent chains of transmission. Healthcare workers must use respiratory PPE when treating suspected pneumonic plague.

Q: Does a plague vaccine exist?

No WHO-approved plague vaccine for global use. Historical vaccines: killed whole-cell vaccine (used in Vietnam War US military, discontinued — limited efficacy against pneumonic plague); live attenuated vaccine (EV76 — used in former USSR, not WHO-approved). Current research: several subunit vaccines (F1 + V antigen) and mRNA vaccines are in clinical development for military and high-risk population use, but none are approved for civilian use.

Q: Where does plague occur in the world?

Active plague foci: Madagascar (largest burden, >75% of global cases); DRC; other African countries (Tanzania, Uganda, Kenya, Zambia, Angola); USA (Southwest states — especially New Mexico, Arizona, Colorado — approximately 7 cases/year, from prairie dogs and squirrels); Peru and Bolivia; Central Asia (Russia, Kazakhstan); China (sporadic from marmot hunting). Plague is a WHO Neglected Tropical Disease and a mandatory reportable disease under the International Health Regulations.

Question 1

What is plague?

Accepted Answer

Plague is an ancient bacterial zoonotic infection caused by Yersinia pestis — transmitted primarily through the bites of infected fleas from rodent reservoirs. It has caused three global pandemics in human history — including the 14th century Black Death (approximately 50 million deaths). It continues to cause approximately 1,000-2,500 cases per year, predominantly in Madagascar, the DRC and Peru. Despite its historical reputation, plague is highly treatable with antibiotics when diagnosed promptly.

Question 2

What are the three forms of plague?

Accepted Answer

Bubonic plague (most common, approximately 80%): flea bite → bacteria reach regional lymph node → massive lymph node swelling (bubo — typically groin, axilla, neck) → fever, chills, extreme malaise. Untreated CFR approximately 30-60%; with antibiotics <10%. Septicaemic plague: bloodstream infection without visible bubo — from flea bite or (rarely) direct exposure. High mortality even with treatment. Skin becomes dark/gangrenous ("black plague"). Pneumonic plague: lung infection — primary (airborne inhalation) or secondary (from bloodstream). Spreads person-to-person through respiratory droplets. Essentially 100% fatal within 24 hours without immediate antibiotics.

Question 3

Why is Madagascar the current plague epicentre?

Accepted Answer

Madagascar has had endemic plague since the 19th century — originally introduced through the port of Toamasina. Plague enzootic cycles maintain Y. pestis in the highland rodent populations. Several factors drive Madagascar's ongoing burden: endemic rat populations; flea infestation of homes; poor housing; limited access to rapid diagnosis and antibiotics in remote highlands; and seasonal plague epidemics (August-November when flea activity peaks). The 2017 Madagascar pneumonic plague outbreak (approximately 2,000 cases, 200+ deaths — the worst in 50 years) demonstrated the potential for rapid urban spread.

Question 4

How is plague treated?

Accepted Answer

Plague is highly treatable if diagnosed early. First-line: gentamicin IV/IM (now preferred) or streptomycin IM — for 10 days. Alternatives: doxycycline or ciprofloxacin (oral or IV). Duration: 10-14 days. Pneumonic plague patients require strict isolation (respiratory precautions) and immediate antibiotic initiation — delay beyond hours dramatically increases mortality. Post-exposure prophylaxis (for contacts of pneumonic plague): 7-day course of doxycycline or ciprofloxacin. Supportive care: IV fluids, vasopressors for septic shock.

Question 5

Can plague spread from person to person?

Accepted Answer

Yes — pneumonic plague (lung infection) spreads efficiently through respiratory droplets over short distances. Bubonic and septicaemic plague do NOT spread person-to-person (require flea bites or direct blood/body fluid contact). When pneumonic plague cases are identified, rapid contact tracing, isolation of cases and post-exposure prophylaxis of contacts are essential to prevent chains of transmission. Healthcare workers must use respiratory PPE when treating suspected pneumonic plague.

Question 6

Does a plague vaccine exist?

Accepted Answer

No WHO-approved plague vaccine for global use. Historical vaccines: killed whole-cell vaccine (used in Vietnam War US military, discontinued — limited efficacy against pneumonic plague); live attenuated vaccine (EV76 — used in former USSR, not WHO-approved). Current research: several subunit vaccines (F1 + V antigen) and mRNA vaccines are in clinical development for military and high-risk population use, but none are approved for civilian use.

Question 7

Where does plague occur in the world?

Accepted Answer

Active plague foci: Madagascar (largest burden, >75% of global cases); DRC; other African countries (Tanzania, Uganda, Kenya, Zambia, Angola); USA (Southwest states — especially New Mexico, Arizona, Colorado — approximately 7 cases/year, from prairie dogs and squirrels); Peru and Bolivia; Central Asia (Russia, Kazakhstan); China (sporadic from marmot hunting). Plague is a WHO Neglected Tropical Disease and a mandatory reportable disease under the International Health Regulations.

Question 8

How does GMJ News cover plague?

Accepted Answer

GMJ News covers WHO plague surveillance data, Madagascar outbreak updates, bubonic vs pneumonic forms, antibiotic treatment evidence, and biosecurity implications. Plague is part of the GMJ's zoonotic disease and health emergency coverage — demonstrating that ancient pathogens remain current public health threats.

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