7.4.4 Case Studies

Question 2

Case study: control of Ebola in West Africa

Answer 2

Entered the human population through bats - asymptomatic carriers, and the local people ate bat meat. Ebola (ebolaviruses) is then carried through bodily fluids, with a short incubation period of two days.

West African countries did not have the history of Ebola outbreaks as equatorial countries. Poor control:

Environmental managemnet

• Land degredation and deforestation –> higher concentration of bat hosts in smaller areas.
• Agriculture shares land with previously native forests. Straw-cooured fruit bats often feed on fruit crops –> contamination.
• Rural areas –> urban centres –> urban slums.

Quarantine

• A highly mobile population across borders for food, work, or social reasons.
• Health responders did not control this movement - when one country began to improve, patients seeking treatment would cross borders and reinfect the recovering population.
• Some people return to their native village to be buried with their ancestors - further promoting the movement of the disease.

Problems with containment

• Initial misdiagnosis - like malaria/typhoid
• Health systems were already understaffed before the outbreak, lacking PPE and isolation units in hospitals making, them a hotspot for spread. This further crippled the healthcare system.

Question 3

Case study: COVID-19

Environmental management, quarantine, containment problems, evaluation

Answer 3

Severe Acute Respiratory Syndrome Coronavirus 2

Virus was asymptomatic and pre-symptomatic transmission + global travel + dense urban centres + lack of immunity –> pandemic

Environmental management

• Disinfection of public spaces, transport, and high-touch surfaces.
• Temporary closure or sanitation upgrades in markets, restaurants, and public spaces.
• Waste management protocols for used PPE, masks, and medical waste.

Quarantine methods

• Nationwide lockdowns and stay-at-home orders in many countries. Travel bans
• Mandatory isolation for positive cases and 14-day quarantine for close contacts or travelers.
• Use of quarantine hotels or designated facilities for international arrivals.
• Digital contact tracing apps and health check systems (e.g., QR code scanning in Asia).

Problems with containment

• Asymptomatic transmission made detection difficult.
• In some regions, overcrowded housing made isolation impractical.
• Misinformation and pandemic denial led to resistance to control measures.
• Economic pressures pushed governments to reopen early, causing new waves.
• Unequal access to testing, quarantine facilities, and vaccines.

Evaluation

• Environmental management was effective in reducing surface and airborne transmission, especially in hospitals and high-density areas.
• Quarantine and lockdowns were initially effective but difficult to sustain long-term due to social and economic impacts.
• Countries that used digital tools and clear communication (e.g. government communication) saw better control outcomes.
• Vaccination later became the most effective long-term control, but early containment depended heavily on quarantine and public cooperation.