- Varicella-zoster virus-specific cellular immunity in subjects given acyclovir after household chickenpox exposure. Kumagai, T., Kamada, M., Igarashi, C., Yuri, K., Furukawa, H., Chiba, S., Kojima, H., Saito, A., Okui, T., Yano, S. J. Infect. Dis. (1999)