When we lived in a normal world, our annual flu date started around January, peaked in February, and died out in March. There could be variations: there were always earlier waves and some later ones; but, year after year, the script was more or less the same. The thing is, we don’t live in a normal world now.


The disease that announced the end of the pandemic. At the beginning of March, the monitoring services of the national health system began to see that something was moving. In a matter of days, a disease that had been missing in action for two full years reappeared in our lives with “almost vertical” growth in incidence and beginning to saturate hospitals: the flu was back.

LESS than 100 DAYS for HERD IMMUNITY: Towards a FUTURE without PANDEMIC

At that time, the news was that with his return it was being certified that the society had overcome de facto the pandemic. Fear and precautions had fallen enough for the flu to start doing its thing again: it was the prelude to what we saw later, the end of the main covid measures.

The yeti in spring. What we did not know for sure was whether it would be a brief peak and then seasonality would do the same, stifling the development of the epidemic; or if, on the contrary, we were going to find ourselves with a manual epidemic flu only to be displaced two months later. In the end, it was the latter. The wave began in March, reached its peak in April and is already beginning to decline (although in some areas such as Seville, due to the crowds linked to the April Fair is growing back).

The flu is back: it is the definitive proof that we have ended the covid pandemic

A new planet in the epidemiological system. It’s not something too rare. In epidemiology it is often said that in the same way that the presence of a planet alters the orbit of the rest, the presence of a new disease alters the behavior of the rest. It is logical that the flu has sought a new way to move around the world: what we do not know is whether this is a temporary thing or whether we are facing the epidemiological “new normality”.

The answer right now can only be speculative: it’s not clear if SARS-CoV-2 will give annual flu-like epidemics, and of course we’re not sure if (if so) those waves will overlap or, like this year, They will come one after the other. What is clear is that reality has just kicked the relatively boring annual epidemiological calendar and this is going to have important health, economic and social implications. Moreover, if, as everything seems to indicate, the weather (which is what produces part of the seasonal effect) is going crazy.

Image | li lin

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