“… 22 Similarly, following a measles outbreak affecting several European countries including Greece during 2016–2018, two Greek seroprevalence studies found that around 13% of pregnant women were seronegative for measles antibodies. 23 , 24 Elsewhere, an African study conducted in Zambia during 2015–2017 among adult women of childbearing age found that 25% of women were seronegative. 25 …”