---
title: >-
  Regional and variant-era variation in treatment patterns and remdesivir use
  among immunocompromised patients hospitalized with COVID-19: an analysis of
  polypharmacy using UpSet plots
description: >-
  Kayla Hendrickson · with Nuvan Rathnayaka, Mark Berry (Gilead), Carrie Nielson
  (Gilead), Alan Brookhart, Kathleen Hurwitz
date: '2026-09-02'
category: Events
canonical_url: https://www.headwaterscience.com/resources/events/other/ispe-2026-poster-c-123/
source: Headwater Science
license: © 2026 Headwater Science. All rights reserved.
slug: ispe-2026-poster-c-123
id: 6VDr64VSMQDfOctRaxPsSV
contentType: article
---

Poster · C-123 · Wed 2 Sep · 12:00–1:30 PM CEST

# Who actually got remdesivir, and where?

A descriptive look at regional and variant-era treatment patterns among hospitalized immunocompromised patients.


![ISPE 2026 event hero background](https://images.ctfassets.net/fea4lj2cdgl5/7I2tVYn8fivb9Cd2IBEk48/a0c18a6f721a2264369580e73aab9aa0/ispe-2026-event-background.png?w=1920&fm=webp&q=75)

## Making complex treatment patterns legible.

Immunocompromised patients face higher risks from COVID-19, and treatment patterns in this group have been under-explored. Understanding how care varies is a first step toward consistency.

This poster describes treatment patterns and remdesivir use in the first days of hospitalization across US regions and variant eras, using UpSet plots to make complex therapy combinations readable. It is descriptive work, developed with co-authors from Gilead.

- Descriptive treatment-pattern study
- HealthVerity hospital data
- UpSet-plot visualization

Citation

Hendrickson K, Rathnayaka N, Berry M, Nielson C, Brookhart A, Hurwitz K. Regional and variant era variation in treatment patterns and remdesivir use among immunocompromised patients hospitalized with COVID-19: an analysis of polypharmacy using UpSet plots. Poster C-123, 42nd ISPE Annual Meeting; August 29–September 2, 2026; Milan, Italy.

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