Brown recluse spider is now considered the most dangerous spider to humans. It's even more dangerous than the highly-dreaded Black Widow because of the way its venom affects the human victim and not just how poisonous it is.

[Brown recluse spider photo: graftedno1]

A bite from the brown recluse spider causes necrosis and this is why people should avoid this spider at all cost.

Necrosis is the premature death of cells in living tissue caused by infection and toxin. Cells that die due to necrosis do not usually send chemical signals to the immune system. This prevents nearby phagocytes from locating and engulfing the dead cells, leading to a build-up of dead tissue and cell debris at or near the site of the cell death. For this reason, it is often necessary to remove necrotic tissue surgically.

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Bites from the brown recluse can be excruciating and it takes months before it heals. Aside from the nasty scar, typical side effects of the attack include dizziness, fever and muscle soreness.

Few deaths were reported as a result of getting bitten, mostly children and elderly individuals.

A study by graduate student Erin Saupe of University of Kansas predicted that the brown recluse spider is slowly spreading in the US. By 2020, by using computer modeling, the possible migration of these spiders can move towards Michigan, Wisconsin, Pennsylvania and New York.

The brown recluse became popular after the report on a student from Texas named Nikki Perez surfaced. Perez was bitten at the Amarillo airport last September 2011 and lost part of her ear and nearly lost her eye sight after being hospitalized for 5 days.

Many spiders are venomous, of course, and some can even kill people. Here we take a look at the ten most dangerous spiders to humans taking into account not just the toxicity of the venom but also the amount the spider administers (and its aggressiveness as well).

10 Most Dangerous Spiders to Humans

1. Brown recluse spider
2. Six-Eyed Sand Spider
3. Brazilian Wandering Spider
4. Sydney Funnel-Web
5. Black Widow Spider
6. Mouse Spider
7. Chinese Bird Spider
8. Redback Spider
9. Fringed Ornamental Tarantula
10. Yellow Sac Spider