Some documented milestones
A chronology tells only one part of the story. However, it allows us to see how societies have gradually linked patient observation, field investigations, microbiology, vaccination, care organization and international cooperation.
1347–1353 · Black pest
This vast plague pandemic has profoundly affected Europe, Asia and North Africa. In societies that still didn't know about bacteria and the role of fleas, the answers mingled isolation, movement control, beliefs and violence. It illustrates the influence of exchanges, living conditions and social reactions.
1796 · Vaccination
Edward Jenner's work on smallpox is a historic milestone in immunization, although inoculation practices were older in several parts of the world. The vaccination would gradually show that it was possible to prevent a disease before symptoms appeared.
1918–1920 · Influenza
The influenza pandemic has affected the world in the context of World War I, with displaced populations and under pressure health systems. It reinforced the importance of monitoring, data collection and collective measures, while revealing the effects of censorship and lack of information.
1980 · Eradical variole
WHO reported that smallpox was eradicated after an international campaign based on vaccination, surveillance and case-based intervention. To date, it remains the only human disease eradicated. This success shows what coordinated and sustainable action can achieve when tools are effective and the objective shared.
1981 · HIV/AIDS
Recognition of the first cases has opened a lasting global crisis. Its history is marked by therapeutic progress, prevention, the mobilization of the people concerned and the fight against stigma. It recalls that a health response cannot succeed without rights, listening and equitable access to care.
2019 · COVID-19
The emergence of SARS-CoV-2 has led to a global pandemic that has disrupted social life, care and the economy. It has accelerated research, genomic surveillance and vaccine development, while showing the difficulties associated with unequal access, misinformation and uncertain decisions.
Three trajectories, three teachings
Smallpox: Eradicate
Vaccination has been combined with surveillance and case-based interventions. WHO recalls that the last known natural case dates back to 1977 and that eradication was declared in 1980. This result does not translate as such into an agent with an animal reservoir.
History of smallpox · WHO1918 Flu: Follow the Waves
War, promiscuity and displacement have encouraged dissemination. Without influenza vaccine or treatments comparable to current resources, cities have used unequal collective measures.
History of 1918 · CDCCOVID-19: Reviewing Decisions
Recommendations have evolved with knowledge on agent, testing, care and vaccines. An institutional chronology places each decision on the date of the data then available.
Chronology · WHO
What history teaches
Agents change, technical means progress and companies never react exactly the same way. However, some principles are regularly found in well-documented crises.
- Detect early: robust monitoring reduces the time between the appearance of a signal and response. It is based on professionals, laboratories, field data and the ability to trace an anomaly.
- Share data: scientific and health cooperation makes it easier to understand. The data must be comparable, explained and sufficiently open for discussion.
- Protecting trust: transparent communication must recognize uncertainty, explain changes in recommendation and publicly correct errors.
- Reducing inequalities: exposure and access to care are unevenly distributed. Housing, work, income, age and access to information strongly influence the consequences of a crisis.
- Prepare in duration: capacity built before a crisis determines a significant part of the response: trained personnel, reasoned stocks, laboratories, coordination and accessible health services.
Read a timeline with caution
Historical figures are often estimates and may vary depending on the methods, the quality of the archives and the territories studied. Old names do not always correspond to modern diagnoses, and the causes attributed to an era may have been corrected later.
A chronology summarizes: it does not alone account for the geographical, social and scientific diversity of an event. Global balance sheets can mask very different local experiences. We must also avoid judging old decisions only with the knowledge and tools available today.
Frequently Asked Questions
Why can the historical records of a pandemic vary?
Archives, diagnostic criteria, territories covered and estimation methods differ according to time and study. A historical figure must therefore be read with its source, period and uncertainty interval when available.
Can we directly compare two pandemics?
Direct comparison is rarely sufficient. The agent, exposed populations, diagnostic means, surveillance systems, access to care and the quality of data available at each time must be reconciled.
What is the purpose of the history of epidemics?
It allows us to study the evolution of surveillance, prevention, care, communication and international cooperation. It also helps to recognize the limitations of data and the unequal social effects of health crises.
To deepen
Historical records of theWHO on Varietal Immunization, CDC on the 1918 Flu and the WHO COVID-19 chronology allow to verify dates and methods. A serious and precise source from which its figures, their uncertainties and the knowledge available at the time come.
