INFECTION AND IMMUNITY. 
43 
egg-albumin or milk. The first injection causes no 
symptoms, but the second, even when the dose is 
smaller, may cause shortness of breath, spasms, and 
death. It requires from ten to fourteen days after the 
first injection for this hypersensitiveness to develop. 
A similar hypersensitiveness has been observed in 
some human beings to the horse serum in diphtheria 
antitoxin, and the symptoms of serum sickness have 
been attributed to it (see Diphtheria, page 94). The 
reactions following the use of tuberculin and mallein 
are also believed to be due to anaphylaxis. This con¬ 
dition of hypersusceptibility is sometimes spoken of 
as Allergy. 
