  Users rely on search engines for information in critical contexts, such as
public health emergencies. Understanding how users evaluate the trustworthiness
of search results is therefore essential. Research has identified rank and the
presence of misinformation as factors impacting perceptions and click behavior
in search. Here, we elaborate on these findings by measuring the effects of
rank and misinformation, as well as warning banners, on the perceived
trustworthiness of individual results in search. We conducted three online
experiments (N=3196) using Covid-19-related queries to address this question.
We show that although higher-ranked results are clicked more often, they are
not more trusted. We also show that misinformation did not change trust in
accurate results below it. However, a warning about unreliable sources
backfired, decreasing trust in accurate information but not misinformation.
This work addresses concerns about how people evaluate information in search,
and illustrates the dangers of generic prevention approaches.
