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\title{We're Christine Kreuder Johnson and Tierra Smiley Evans, from UC Davis.
We developed an oral sampling technique to screen for pathogens in
primates which allows researchers to samples previously missed primate
populations- Ask Us Anything!}



\author[1]{PLOSScienceWednesday }%
\author[1]{r/Science AMAs}%
\affil[1]{Affiliation not available}%


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  \date{April 24, 2026}


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\begin{abstract}
Hi Reddit! My name is Christine Kreuder Johnson, I am a Professor of
Epidemiology at the University of California School of Veterinary
Medicine's One Health Institute. Joining me today is Tierra Smiley
Evans, a veterinarian and graduate student in epidemiology at UC Davis
who developed the primate sampling technique published recently in PLOS
NTDs, ``Optimization of a Novel Non-invasive Oral Sampling Technique for
Zoonotic Pathogen Surveillance in Nonhuman Primates'', that we will be
discussing today. CHRISTINE KREUDER JOHNSON -- My research focuses on
ecological processes that impact wildlife and public health. I am
especially interested in finding new ways to investigate disease in
endangered species and identifying One Health solutions for protecting
human and animal health. Most recently, I work with a consortium of
partners on USAID's Emerging Pandemic Threats PREDICT project to develop
global surveillance capabilities to detect infectious disease threats
with pandemic potential. We focus on zoonotic viruses that spillover
from animals to cause disease in humans and we work at the highest-risk
interfaces around the world where new diseases are most likely to
emerge. Our published study ``Spillover and Pandemic Properties of
Zoonotic Viruses with High Host Plasticity'' highlights many of the
epidemiologic circumstances promoting spillover, amplification, and
spread of zoonotic viruses that we are investigating in order to direct
interventions aimed at disease prevention. TIERRA SMILEY EVANS -- My
research focuses on zoonotic disease transmission in human and non-human
primate communities in Africa and Asia. I have conducted field research
in Uganda, Rwanda, Nepal and Myanmar and I am particularly interested in
developing non-invasive diagnostics for wildlife that can enable us to
understand disease dynamics in these remote settings. Our recent PLOS
NTDS article describes a non-invasive sampling technique that involves
distributing a rope for primates to chew on that can be retrieved and
screened for pathogens that are present in the mouth. This method
provides an alternative approach to anesthetizing wild primates to test
for diseases and enables sampling of populations that otherwise would
not be able to be sampled. Our methods can be applied to studies
examining primates as sources of diseases that could affect humans in
remote tropical settings. Our study and its implications for public
health is also discussed in a post on the PLOS Student Blog. We are
looking forward to answering your questions at 1pm ET today --- Ask Us
Anything!%
\end{abstract}%



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