Are people affected by fertilizer

Yes.

While people are more affected by pesticides, fertilizer runoff often results in proliferation of organisms such as cyanobacteria, which have powerful ecological effects.

Algal blooms (overgrowth of cyanobacteria) can kill fish and wildlife, accumulate in seafood that humans consume, and also create powerful neurotoxins that have been known to make people extremely ill and, in some cases, can cause irreversible neurological damage or death.