Publisher Correction: npj Vaccines, volume 4

An error occurred during the publication of a number of articles in npj Vaccines. Several articles were published in volume 4 with a duplicate citation number.

In this correction article the old and new citation metadata are published in Table 1.

Table 1.

Overview of incorrect and correct citation metadata

DOI	Published online date	Incorrect citation number	Correct citation number
10.1038/s41541-019-0117-5	03 June 2019	1	25
10.1038/s41541-019-0118-4	03 June 2019	2	26
10.1038/s41541-019-0119-3	25 June 2019	3	27

The original articles have been updated. The publisher apologises for the inconvenience caused to our authors and readers.