A structural explanation for the low effectiveness of the seasonal influenza H3N2 vaccine
Nicholas C. Wu, et al., in PLOS|Pathogens
Published: October 23, 2017

What About:
Researchers with The Scripps Research Institute in La Jolla, California have published a study regarding the ineffectiveness of the annual influenza vaccine.

Influenza vaccination responses: Evaluating impact of repeat vaccination among health care workers.
Leung VKY1,et al., in Vaccine, 35(19):2558-2568.
Published: May 2, 2017;
https://doi: 10.1016/j.vaccine.2017.03.063. Epub 2017 Apr 3.

What About:
Researchers from Australia showed that those who had multiple flu vaccines actually produced fewer antibodies than those who did not get the flu shot regularly.

Waning vaccine protection against influenza A (H3N2) illness in children and older adults during a single season.
Belongia EA, et al., in Vaccine, 33(1):246-51.
Published: Jan 1, 2015.
https://doi: 10.1016/j.vaccine.2014.06.052. Epub 2014 Jun 21.

What About:
Researchers of the Wisconsin’s Marshfield Clinic Research showed that getting the flu shot two years in a row lowered protection.

Factors associated with maintenance of antibody responses to influenza vaccine in older, community-dwelling adults.
Talbot HK, at al., in BMC Infectious Diseases, 15:195.
Published: April 23, 2015.
https://doi: 10.1186/s12879-015-0926-8.

What About:
Researchers of the Wisconsin’s Marshfield Clinic Research showed that natural immunity was more effective than vaccination against flu.

Influenza Vaccine Effectiveness in the Community and the Household
Ohmit, Suzanne E., et al., in Clinical Infectious Diseases, 56(10):1363–1369
Published: May 15, 2013

What About:
A study in which there was lower effectiveness of influenza vaccination with repeated vaccination. Also, there was no evidence that vaccination prevented household transmission once influenza was introduces; adults were at particular risk despite vaccination.

Association of spontaneous abortion with receipt of inactivated influenza vaccine containing H1N1pdm09 in 2010–11 and 2011–12
Donahue, James G. et al., in Vaccine, 35(40):5314-5322.
Published: September 25, 2017

What About:
A study reveals a clear association between the flu vaccine given to pregnant women and spontaneous abortion within 28 days from vaccination.

Infectious virus in exhaled breath of symptomatic seasonal influenza cases from a college community
Yan, Jing et al. in PNAS 2018;
Published ahead of print January 18, 2018

What About:
A study on flu virus transmission found that subjects had 6.3 times more aerosol shedding of flu virus particles if they received vaccination in the current and previous season compared with having no vaccination in those two seasons.