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The idiom "When it rains, it pours" usually means that when things go wrong, a lot of things go wrong at the same time. But in this context, things about vaccines appear going well ("researchers say the data look good enough to merit testing the vaccines"). So the idiom seems to mean differently here.
What does it mean then?
================
When it rains, it pours. In the past few days, scientists working at feverish pace to develop vaccines against the coronavirus have released a flood of data from their first human trials.
The results come from phase I and II trials of four promising vaccine candidates and detail how people respond to the jabs. Because the trials were focused on safety and dosing, the data cannot say whether the vaccines will prevent disease or infection — large-scale efficacy trials are needed for this. But they suggest that the candidate vaccines are broadly safe, and offer the first hints that vaccines can summon an immune response that resembles that of people who have been infected with the virus. Crucially, researchers say the data look good enough to merit testing the vaccines in efficacy trials, in which volunteers receive a vaccine or placebo and rates of COVID-19 disease are compared between groups.
Source: Nature 21 JULY 2020
Coronavirus vaccines leap through safety trials — but which will work is anybody’s guess
https://www.nature.com/articles/d41586-020-02174-y
What does it mean then?
================
When it rains, it pours. In the past few days, scientists working at feverish pace to develop vaccines against the coronavirus have released a flood of data from their first human trials.
The results come from phase I and II trials of four promising vaccine candidates and detail how people respond to the jabs. Because the trials were focused on safety and dosing, the data cannot say whether the vaccines will prevent disease or infection — large-scale efficacy trials are needed for this. But they suggest that the candidate vaccines are broadly safe, and offer the first hints that vaccines can summon an immune response that resembles that of people who have been infected with the virus. Crucially, researchers say the data look good enough to merit testing the vaccines in efficacy trials, in which volunteers receive a vaccine or placebo and rates of COVID-19 disease are compared between groups.
Source: Nature 21 JULY 2020
Coronavirus vaccines leap through safety trials — but which will work is anybody’s guess
https://www.nature.com/articles/d41586-020-02174-y
