In some countries, antibiotics are used to fight bacterial bee diseases such as American foulbrood. In Switzerland as well as in the European Union, however, the use of antibiotics in beekeeping is not permitted.

Antibiotika in der Imkerei - Weshalb sind sie in der Schweiz verboten? (German (PDF, 209 kB, 24.09.2016) and French (PDF, 252 kB, 24.09.2016)) Antibiotics in Beekeeping – Why Are They Prohibited in Switzerland?
L. Gauthier, C. Kast (2012)

Honigqualität und Antibiotikarückstände (German (PDF, 40 kB, 14.09.2016), French (PDF, 36 kB, 15.09.2016) and Italian (PDF, 34 kB, 14.09.2016)) Honey quality and residues of antibiotics
S. Bogdanov, P. Fluri (2001)

Sulfanilamide: an unexpected antibiotic found in honey (PDF, 58 kB, 14.09.2016)
S. Bogdanov, P. Edder (2004)