In the early 1950s there were four vaccines routinely used in the United States: diphtheria, tetanus, pertussis, and smallpox. Three of these vaccines (diphtheria, tetanus, and pertussis) were ...

Chronic application of detergent preservatives can lead to chronic lymphocytic infiltration in conjunctival stroma as well as deleterious changes to corneal epithelium and tear film instability.

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