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B19 or B-19 may refer to: B19 (New York City bus), serving Brooklyn Douglas XB-19, an experimental bomber aircraft Parvovirus B19, the virus that causes fifth disease Caro–Kann Defence ECO code in chess Patient B-19 Boron-19 (B-19 or 19B), an isotope of boron LNER Class B19, classified B2 until 1945