Bacteria, viruses, antibodies, and other?

! - Bacteria are large, single cell, killed by antibiotics. Viruses are small, more like the size of a cell nucleus, with few drugs that effect them.

2 - We develop antibodies against both is that right? Once an antibody is developed against a virus, we would be set for life, until a slightly different strain. this is why we have fewer colds as we get older. But that is not true in the case of bacteria is it?

3 - If a single instance of a bacteria or virus getting into our blood could infect us, it seems to me we could never avoid such. There must be more to it, a minimal number of ''jerms'', or something. I'm confused about that.

4 - We have other defenses, in what sort of cases do they get the job done without antibodies.?

Thanks

Bacteria, viruses, antibodies, and other?cafe racer

In response to

1.) Bacteria are LARGER than viruses; in all its terms, they are not large, but relatively larger to viruses (protozoans are LARGER in some respects to bacteria, so this defeats the definition of bacteria being large organisms). Antibiotics are but one kind of medication, i.e. there are a lot of them, but the same one--antibiotic; viruses are not cellular organisms, so the drugs directed to them are different from those used for bacteria.

2.) Actually, we would not necessarily be ''set for life'' as the titer of antibodies in our system can only last until the next re-challenge, which is the anamnestic response stage; this is like getting vaccinated, in that vaccination induces the production of antibodies, but you still need to get the booster shot after some number of years depending on the vaccine because they are not meant for lifetime protection (in general terms, your immune system ''knows'' a pathogen, but forgets it after some time because it does not constantly ''remember'' the pathogen). This standard is the same for ALL pathogens, whether they are viral, bacterial, fungal, or parasitic in nature.

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