Three items: First, Cycle Thresholds. In the New York Times this past weekend: “Your Coronavirus Test Is Positive. Maybe It Shouldn’t Be.” The article explained that PCR testing is not merely a yes-or-no on coronavirus infection, but that it measures the viral load. In particular, “number of amplification cycles needed to find the virus, called the cycle threshold” is crucial information because a higher threshold identifies people as testing positive who have extremely tiny viral loads and are not infectious. ... Read more