Tohoku J. Exp. Med., 2016 June, 239(2)

Perinatal Coxsackievirus B3 Infection with Transient Thrombocytopenia

AKIMUNE KAGA,^1,2 YU KATATA,¹ AKIRA SUZUKI,^3,4 KANAKO OTANI,³ HIROSHI WATANABE,¹ SETSUKO KITAOKA¹ and SATORU KUMAKI¹

¹Department of Pediatrics, National Hospital Organization Sendai Medical Center, Sendai, Miyagi, Japan
²Division of Neonatology, Tohoku Kosai Hospital, Sendai, Miyagi, Japan
³Virus Research Center, National Hospital Organization Sendai Medical Center, Sendai, Miyagi, Japan
⁴Department of Pediatrics, Tohoku University Hospital, Sendai, Miyagi, Japan

Coxsackievirus (Cox) B is the second common picornaviruses, after echovirus, detected from children younger than 2 months of age. Neonates who present with Cox B3 infection in the first week are known to have severe illness such as myocarditis or menigoencephalitis. Severity is commonly associated with perinatal vertical transmission. Here, we report a neonatal case of Cox B3 infection with severe thrombocytopenia through horizontal transmission. The patient was a preterm infant born without asphyxia by selective cesarean section. From his 6^th day of life, the patient had recurrent episodes of apnea. At that time, the laboratory investigations revealed a profound thrombocytopenia without any evidence of inflammation. Thus, neonatal alloimmune thrombocytopenia (NAIT) was suspected, and the patient received transfusion of immunoglobulin and platelets. Thereafter, the patient had no further episodes of apnea, and platelet counts of the patient increased gradually. Later, the possibility of NAIT was ruled out by the result of the platelet antigen genotyping of the patient and his parents. Culture obtained from his nasopharynx was positive for Cox B3. We thus speculate that the patient was exposed to the virus from his mother because she had a febrile episode at her 5^th day after delivery, and her Cox B3 infection was confirmed by serology. Assuming that the thrombocytopenia was a complication of Cox B3 infection, the immunoglobulin transfusion might have provided a neutralizing antibody against Cox B3. It is important to consider the possibility of enterovirus infection as a differential diagnosis whenever unexplained thrombocytopenia was observed in neonates.

keywords —— apnea; coxsackievirus B3; perinatal infection; preterm infant; thrombocytopenia

© 2016 Tohoku University Medical Press

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Tohoku J. Exp. Med., 2016, 239, 135-138

Correspondence: Akimune Kaga, Division of Neonatology, Tohoku Kosai Hospital, 2-3-11 Kokubun-cho, Aoba-ku, Sendai, Miyagi 980-0803, Japan.

e-mail: kagakimune@yahoo.co.jp