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A Matter of WHO
- Año: 1961
- País: United Kingdom
- Género: Misterio, Crimen, Drama
- Estudio: Foray
- Palabra clave: outbreak, epidemic, smallpox
- Director: Don Chaffey
- Emitir: Terry-Thomas, Sonja Ziemann, Alex Nicol, Richard Briers, Honor Blackman, Guy Deghy