Birgitta Eivor Moylan, a Johns Hopkins bacteriologist who studied allergies and was the matriarch of the Swedish Club in Baltimore, died of congestive heart failure Oct. 23 at her Homeland residence. She was 84.

Born in Stockholm, Sweden, she was the daughter of Sigurd Valther Jansson, an executive with the Stockholm Tramways, and Irma Birgitta Andersson Jansson, who owned a restaurant called Fregatten.

She spent her teenage years working at her great-aunt’s general store on the island of Yxlan in Stockholm’s archipelago. She graduated from Bromma Kommunala Flickskola in 1959 and later attended the Karolinska Institute, a medical university, where she trained as a bacteriologist.

In October 1963, she moved to Baltimore’s Hamilton neighborhood to join a team at Johns Hopkins Hospital as

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