It’s anyone’s guess

 

something is anyone’s guess 

used for saying that something is not known by anyone

 

ワクチンは信じられてきたほどには効かない https://t.co/W0amzMzHsp　フロリダで7/4に起きた469人の集団感染者の3/4がワクチン接種者。ワクチン接種後に感染するものの重篤化の確率は低いとされてきたがそれも怪しい。

— Spica (@Kelangdbn) August 22, 2021

Science can’t keep up with coronavirus, creating worry for vaccinated There’s growing concern that vaccinated people may be more vulnerable to serious illness than previously thought. Bloomberg | PUBLISHED ON AUG 21, 2021 07:58 PM IST

All that said, some facts are well established at this point. Vaccinated people infected with the virus are much less likely to need to go to the hospital, much less likely to need intubation and much less likely to die from the illness. There’s no doubt that vaccines provide significant protection.

For the time being, there are simply more questions than answers. Are breakthrough infections ticking up because of the delta variant, waning immunity or a return to normal life? Are vaccinated people more vulnerable to severe illness than previously thought? Just how common are breakthrough infections? It’s anyone’s guess

効かないんじゃなくて、効くんだけど、思ったほど効くかどうかは誰もわからないんだ、と。