What Causes Infant Botulism? Infant botulism is caused by a toxin (a poison) from Clostridium botulinum bacteria, which live in soil and dust. The bacteria can get on surfaces like carpets and floors and also can contaminate honey. That's why babies younger than 1 year old should never be given honey.

Bacteria
Bacillus spp
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Hypersensitivity reactions are broadly classified into four different types. 
Which of the following hypersensitivity occurs via IgE antibody?

a) Type I hypersensitivity
b) Type II hypersensitivity
c) Type III hypersensitivity
d) Type IV hypersensitivity

When allergen crosslinks with IgE bound to the Fc receptor on the mast cells, the allergen induces the release of mediators. 
Which of the following receptor have a high affinity towards IgE?

a) FcεRI
b) FcεRII
c) Both of the above
d) None of the above

Allergy to penicillin is an example of

a) Type I hypersensitivity
b) Type II hypersensitivity
c) Type III hypersensitivity
d) Type IV hypersensitivity

Type I hypersensitivities require which of the following initial priming events to occur?

A -sensitization
B- secondary immune response
C -cellular trauma
D- degranulation

Asthma is an example of

1_Type I hypersensitivity
2_Type II hypersensitivity
3_Type III hypersensitivity
4_Type IV hypersensitivity

Type I hypersensitivity is mediated by

1_B cells and IgE
2_mast cells and IgG
3_mast cells and IgE
4_B cella and Ig G

All are examples of Type I hypersensitivity except

1_penicillin allergy
2_serum sickness
3_dust sickness
4_pollen allergy