. Author manuscript; available in PMC: 2019 Mar 18.

Published in final edited form as: JAMA Oncol. 2016 Dec 1;2(12):1656–1657. doi: 10.1001/jamaoncol.2016.2437

Table.

Titers Before and After Influenza Vaccination

Titer	Before Vaccination	After Vaccination	P Value
GMT (95% CI)
A/CA/09	19.3 (10.4–35.7)	27.8 (12.8–60.3)	.04
A/TX/12	17.9 (9.4–34.1)	38.6 (19.3–77.0)	.002
B/MA/12	9 (5.7–14.0)	12.9 (7.5–22.1)	.02
HAI Titer ≥1:40, No. (%) [95% CI]^a
A/CA/09	8 (42) [20.3–66.5]	10 (53) [28.9–75.6]	.25
A/TX/12	6 (32) [12.6–56.6]	14 (74) [48.8–90.9]	.004
B/MA/12	2 (11) [1.3–33.1]	5 (26) [9.2–51.2]	.13

Abbreviations: A/CA/09, A/California/7/2009; A/TX/12, A/Texas/50/2012; B/MA/12, B/Massachusetts/2/2012; HAI, hemagglutination inhibition assay; GMT, geometric mean titer.

The number corresponds to the number of patients with HAI titer ≥ 1:40 for each virus. The numbers do not total 19 since every patient is represented in each row.