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Background  Bovine babesiosis, commonly known as redwater fever, is a sporadic tick-borne disease in the United Kingdom. Outbreaks occur during the spring, summer and autumn months when ticks are active. This study reports the findings of an investigation of an outbreak of bovine babesiosis during the winter month of February, 2019.    Methods  DNA from blood, organ and tick samples taken from affected cattle were tested for the presence of piroplasm and  Anaplasma phagocytophilum  DNA using PCRs directed to the  18S  rRNA gene and  msp2  gene respectively. The species of piroplasm was confirmed by sequencing.    Results   Babesia divergens  DNA was detected in the blood of five cattle displaying clinical signs of babesiosis within a herd of twenty. This parasite was also detected in three of ten ticks removed from one of the affected cattle. In addition,  A. phagocytophilum  was detected in three cattle tested and two of ten of the ticks.    Conclusions  An outbreak of bovine babesiosis during February is unusual as the tick vector,  Ixodes ricinus , does not generally become active until temperatures rise later in the year. February of 2019 was unusual as average temperatures during the first week of the month reached over 10 °C, well above historical averages that are typically below 5 °C, and a temperature at which ticks can become active. This unusual weather event is likely to have triggered tick questing, that combined with a co-infection with two tick-borne pathogens caused the severe outbreak of disease.

parasites and vectors

An outbreak of bovine babesiosis in February, 2019, triggered by above average winter temperatures in southern England and co-infection with Babesia divergens and Anaplasma phagocytophilum