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Acarapis woodi adult bees adult honey-bees alvei American foulbrood antibiotics apparently Ascosphaera apis Aspergillus Bacillus larvae bacteria Bacterium Bailey become Bee World beekeeping Bienenztg brood-rearing cause cells combs culture cysts days old dead larvae diseased colonies diseased larvae drones drugs early summer effect eggs ejected endemic endemically infected epidemic Epidemiology epithelium erythromycin European foulbrood externus faecal faeces fumigation grow haemolymph healthy bees heavily infested hind-gut hive honey honey-bees individual bees infected colonies infected larvae infectious diseases infested bees Isle of Wight Malpighian tubules mid-gut mites natural nectar nectar-flows Nosema apis Nosema disease nurse bees occur paralysis parasite particularly pathogens Plate pluton poisoning pollen probably propupae pupae queens removed resistant Rothamst sacbrood Schweiz sealed brood seems species spiracles spores spring strains Streptococcus pluton sucrose survive susceptible syrup temperatures terramycin thoracic tissue tracheae treatment unsealed usually virus wax moths Wight disease winter worker bees yeast