USF Researchers Map Toxoplasma Gondii Growth Cycle Using Advanced Neon Fluorescent Imaging System to Identify Treatment Vulnerabilities

USF researchers use neon fluorescent tags to reveal the unique overlapping cell cycle of Toxoplasma gondii, paving the way for new chronic infection treatments.

By: AXL Media

Published: Mar 24, 2026, 5:40 AM EDT

Source: Information for this report was sourced from University of South Florida

Visualizing the Invisible Threat of Toxoplasmosis

The microscopic complexity of the Toxoplasma gondii parasite has long hindered the development of effective medical interventions for a pathogen that infects nearly a third of the global population. Researchers at the USF Health Morsani College of Medicine have broken this diagnostic barrier by adapting a fluorescent imaging system traditionally reserved for human cellular analysis. By enabling the real-time observation of the parasite’s development, the team has provided a new lens through which to study an organism that successfully colonizes both humans and animals. This breakthrough is particularly significant for understanding how the parasite transitions from an acute, treatable infection into a chronic state that currently lacks a cure.

The Clinical Challenge of Chronic Parasitic Cysts

Toxoplasmosis typically enters the human host through contaminated water, produce, or undercooked meat, often presenting as a mild illness that can be suppressed if caught within a two week window. However, according to associate professor Elena Suvorova, the drugs required for this suppression can be toxic when administered over long periods. If the infection is not neutralized early, the parasite enters a chronic phase, hiding from the immune system by forming resilient cysts within the brain. The inability to observe this transition in real time has previously left a significant gap in the medical community’s ability to prevent the formation of these permanent neurological clusters.

Decoding an Unconventional Cellular Architecture

The fundamental difficulty in treating Toxoplasma gondii stems from its refusal to follow the standard biological rules of cell division. In a typical human cell cycle, an organism grows larger and copies its DNA before splitting into two identical parts in a linear sequence. According to research scientist Mrinalini Batra, Toxoplasma does not adhere to this predictable pattern, making it nearly impossible for scientists to determine the arrangement or existence of specific growth stages. Mapping this cycle was not merely a matter of academic interest but a necessary prerequisite for identifying the exact moment the parasite begins to multiply and spread through host tissue.