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Key Facts

• Ticks must feed for 24+ hours to transmit most infections
• Anaplasmosis (Anaplasma phagocytophilum): invades white blood cells, causes fever, lethargy, joint pain
• Two forms: granulocytic anaplasmosis and infectious cyclic thrombocytopenia
• Signs appear 1-2 weeks after tick bite
• Diagnosis: CBC, blood smear, serology, PCR testing
• Antibodies can persist for years — positive test does not always mean active infection
• Treatment: doxycycline for 2-4 weeks; most pets recover fully
• Co-infections are common (Lyme + anaplasmosis from same tick)
• No vaccine available for anaplasmosis — tick prevention is essential
• Thrombocytopenia (low platelets) can cause nosebleeds, bruising
• Can affect both dogs and cats, though rare in cats