The Great Plague, the Great Fire, and the Great Illusion

In the heatwave summer of 1665, as the Great Plague of London tightened its grip on a city that still believed disease traveled by miasma, misfortune, or divine displeasure, a splendid practical solution presented itself.

When a household was diagnosed with bubonic plague, the doors were boarded shut for forty days, the occupants were sealed inside, and an armed watchman was stationed outside the house to ensure compliance. It was an admirably decisive measure, confident, visible, and almost entirely ineffective against a disease transmitted not through the air, but by the bites of rat fleas.

The prevailing theory of the time held that illness spread through miasma, a word that conveyed both scientific seriousness and near total misunderstanding. Miasma referred to “bad air,” foul vapors arising from decay, filth, or stagnant surroundings, believed capable of carrying disease into the body. The idea possessed a certain intuitive charm. Cities smelled terrible. Plagues followed squalor. Correlation masqueraded as causation, and without microscopes or germ theory, the explanation seemed as rational as any other available.

The final resolution, if one may use so dramatic a phrase for so indiscriminate an event, arrived the following year when the Great Fire of London burned through much of the city, destroying homes, livelihoods, and, quite incidentally, roasted a substantial proportion of the rat population along with their parasitic passengers.

So that this awful event should not be easily forgotten, it was commemorated in easy form for millions of schoolchildren in the rhyming couplet:

In sixteen-hundred and sixty six
The City of London was burned to sticks.

Public health by burning down entire cities is rarely recommended today, though history occasionally reminds us that catastrophe sometimes succeeds where policy struggles, so we can say that we have, by most measures, advanced since 1665.

Today, rather than boarding up doors and posting watchmen, societies rely on surveillance networks, laboratory diagnostics, vaccination campaigns, antimicrobial therapies, and international coordination systems designed to identify, contain, and manage outbreaks with something approaching scientific coherence. None of these mechanisms are perfect, but all of them are preferable to seventeenth-century improvisation.

Which brings us, inevitably, to the World Health Organization.

WHO does not function as a global government, nor as a planetary emergency room issuing commands to sovereign states. Its role is less theatrical and far more technical. It gathers and analyzes epidemiological data from across the world. It supports disease surveillance so that outbreaks are detected early rather than recognized only when hospitals fill. It coordinates laboratory networks capable of confirming diagnoses beyond the capacity of local facilities.

It also develops evidence-based guidelines on treatment, vaccination, infection control, and containment strategies. It mobilizes expertise and logistical support when countries face emergencies that overwhelm national resources. It helps align cross-border responses, because viruses and bacteria have never shown much respect for immigration policy.

For large and wealthy nations with expansive research institutions, pharmaceutical industries, and deeply funded public health agencies, it is tempting to view such coordination as optional. For small island nations and modestly resourced countries such as Ecuador, it is something closer to essential infrastructure. They do not maintain vast vaccine development programs. They cannot rapidly construct genomic surveillance systems each time a new pathogen appears. They depend instead on shared intelligence, pooled research, standardized protocols, reference laboratories, and training frameworks that allow them to respond with competence rather than guesswork.

Even WHO’s less noticed activities, the ones that seldom attract political speeches, shape outcomes in ways difficult to dramatize. Vector control programs, including those targeting mosquito-borne diseases such as yellow fever, malaria, and dengue, require coordination across borders, climates, and bureaucracies. Technical guidance, data sharing, and logistical planning determine whether interventions arrive before seasonal transmission peaks rather than after.

Here in Ecuador, infectious disease remains stubbornly grounded in daily reality. Tuberculosis, that ancient companion of humanity, has generated renewed concern, with clinicians and public health authorities noting rising case numbers and persistent challenges involving detection, treatment adherence, and drug resistance. TB advances without spectacle. It exploits poverty, crowding, malnutrition, and interrupted care. Managing it demands surveillance, reliable drug supply chains, standardized treatment regimens, and international cooperation, particularly when resistant strains emerge.

None of this feels abstract to me.

There was a period in my professional life when I was responsible for infection control departments in institutions housing more than a thousand beds and employing roughly five hundred staff. Hospitals and prisons, though very different in purpose, share certain epidemiological characteristics: enclosed populations, complex human movement, limited tolerance for error. We managed tuberculosis when compliance wavered, AIDS when fear outran understanding, measles and chickenpox when vaccination gaps revealed themselves with ruthless clarity, and COVID when the modern world rediscovered, sometimes reluctantly, that pathogens travel more efficiently than policy decisions.

Experience teaches a lesson that rarely fits neatly into political slogans. Disease control is not merely biomedical. It is organizational, logistical, psychological, and political. It depends on trust in evidence, consistency of messaging, and an acceptance that microbes remain unimpressed by ideology.

Which makes recent developments difficult to ignore. The United States, historically WHO’s largest funder and a central participant in global health initiatives, has again chosen to withdraw from participation and funding. Nations are entitled to critique international institutions, and WHO is certainly not immune to criticism, yet the arithmetic of global disease control does not obviously improve when the largest contributor steps away without clearly articulating an alternative framework of comparable scale.

History offers cautionary examples of what occurs when scientific consensus yields to political conviction. In the early 2000s, South Africa’s leadership under Thabo Mbeki questioned the link between HIV and AIDS, delaying the widespread deployment of antiretroviral therapy while promoting nutritional remedies such as garlic and beetroot. The consequences were measured not in academic debate but in preventable deaths. False beliefs, when amplified by authority, become public health hazards.

Global health institutions exist precisely to reduce the likelihood of such detours into wishful thinking. WHO provides a forum where evidence, however provisional or contested, is debated by scientists rather than improvised by politicians with strong opinions and limited virology training.

The question, therefore, is not whether WHO is flawless, but what credible alternative could realistically replace it. What institution would coordinate surveillance across continents, support countries lacking extensive research capacity, standardize treatment protocols, assist with outbreak response, and work, however awkwardly at times, with governments of every imaginable persuasion? The world contains democracies, autocracies, fragile states, wealthy federations, and tiny island nations with populations smaller than a provincial shopping mall. Pathogens visit them all.

One hopes that disengagement proves temporary and that reflection yields recalibration. Microbes still travel, data must follow and expertise must circulate. Cooperation, though periodically unfashionable, remains less costly than global catastrophe.