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Prelude to a Pandemic

The first wave is just beginning, not ending. For New York, the virus was a catastrophic eradication of life that was previously unimaginable. The economic calamity only worsened the forlorn feeling of the populace. The reality is that confirmed cases are less than five percent of the population in New York. Nationally, the number is less than one percent. Ninety-nine percent of the population remains susceptible to the disease, and a vaccine at scale is at least six months away. The good news is that the fatality rates appear lower than initially measured. The bad news is that the US reproduction rate’s current growth would return to the May 1st level by July 4th. The implication: the larger confirmed base would require further targeted constraints on movement in the US and globally.

The reproduction rate is a better measure of virus spread than the confirmed case amount.

Experience is usually a good teacher. Unfortunately, sometimes we forget even the hardest lessons. The past three months subjected the world to a degree of concurrent uncertainty not experienced for generations. Therein lies the genesis of the problem. When asked merely to wait at home and practice prudent disease spread mitigation measures in public, some of the populace rebelled, specifically in the US.

The economic torment unfolding justified some of the negative response to the closures. The fiscal stimulus provided a credible counter to this prior argument, with some people receiving more in government support than they did while working and others much less. Nevertheless, the closures manifest monetary misery for most. The urgency to diminish this aftermath by evading its most virulent economic effects is palpable.

This urge emanates from the rising confirmed cases, which is an ominous omen (exhibit 1). The complication is that this measure is an inadequate benchmark for action because it is an absolute and not a relative measure. The distinction is imperative for timely and credible policy action. Act too early, and policymakers appear alarmists. Act too late, and they seem apathetic.

Exhibit 1. US COVID19 Confirmed Cases (7-days average)

Source: Capital Risk Calculations and John Hopkins Data.

Confirmed cases are a faulty measure. As the base of people grows who contracted the virus and remain contagious, so do the number of new confirmed cases. An identical reproduction rate results in vast differences in the number of people infected daily in this illustration.

Ten thousand confirmed cases result in a thousand new cases per day for ten days with a reproduction rate of two. In contrast, one thousand people would result in one hundred instances per day. This elementary mathematical law thus reveals the vulnerability of confirmed cases as a measure: despite low levels of reproduction, it escalates over time. Confirmed cases are increasing, but the reproduction rate lingers near its low.

The key is that new cases are growing at a slower rate than before, not the absolute number of cases (exhibit 2). This is where the trouble arises. The reproduction rate recently stopped falling and is growing again (mid-June). This fallout is the motivation for apprehension. When the reproduction rate is on a declining trend, virus dormancy is foreseeable, despite growing cases. Now, the path is at best uncertain, and, probably, sinister for society.

Exhibit 2. US Reproduction Rate