"Everybody must have information about protection against diseases."

Translation: Todos devem ter informações sobre proteção contra doenças.

[Rob3x]

Should "Todos devem ter informação sobre proteção contra doenças" also be correct? If not, when should "informação" be singular and when should it be plural?

[Paulenrique]

In general, informação is used in plural. But you may also hear "uma informação, nenhuma informação, alguma informação, etc"

[the1exile]

Could someone explain why informação is plural here and proteção is singular? Is that just generally how they are used?

[Paulenrique]

Yes. "Informações" is usually plural in Portuguese since it often involves more than one piece of information.

[morgangianola]

Why is dever in the present instead of the future tense here? Earlier "he must have" was translated as "ele deverá".

[Chaimalka]

why is it wrong to put "a" before protecao and doencas?