Formally, before the emergence of Covid-19. Curfew was synonymous with terrorism, land-clashes, robberies or social breakdown that were breach to public peach. All this are perpetrated by other human-beings.
In biology, multicellular; are living things made up of more than one cell, and unicellular are made with more cells. Now, going with this definitions, criminals are multicellular living things who steals and can murder in the process. Likewise unicellulars also steal from human beings, and can also kill in the process.
A case is in point is that, Covid-19 virus which is unicellular just like Hiv invades humans’ cells where they steal genetic material to propagates and in the process can kill you [human].
Now, according to definition of security as per Oxford Advanced Learner’s Dictionary: “Is the activities involved in protecting country, building or person against attack or dangers,” end of quote. So, from this definition; insecurity can be brought about by both multicellular animals and unicellular microbes.