Pygmy sperm whales are tiny ocean mammals that hide far from land. They travel in small groups and dive deep to eat squid and fish. Because they are quiet and rarely surface, scientists see them only a little.
Strandings Help Scientists Learn
Most of what we know comes from whales that wash up on beaches. In the southeast United States, many of these whales strand, giving researchers a chance to study them.
Hidden Stomach Bugs Found
When scientists examined the dead whales, they often found stomach ulcers. Some ulcers were linked to a type of bacteria called Helicobacter, which also lives in humans.
By looking at over 20 years of stranded whales, a team from Florida Atlantic University and other schools discovered three new Helicobacter strains that had never been recorded before. They called them Kogia Helicobacter 1, 2, and 3.
How the Bacteria Were Detected
From 1999 to 2020, the researchers responded to 59 stranded pygmy sperm whales and examined most of them. In four whales they saw spiral‑shaped bacteria in the stomach.
Further lab tests, including DNA sequencing, proved these bacteria were new types.
Whales Show Signs of Illness
All four infected whales had stomach damage such as inflammation, ulcers, scar tissue, and worm infestations. One also had colon inflammation, suggesting the bug might affect more than just the stomach.
Although the bacteria were not listed as the cause of death, the repeated stomach problems hint that the infection could make whales sick over time.
Why It Matters
Helicobacter has been found in other marine mammals since 2000. Infections can cause low energy, loss of appetite, vomiting, and ulcers—symptoms similar to those in humans.
If these bugs cause chronic illness, they could threaten whale populations, especially those already at risk.
Future Steps
Because pygmy sperm whales are hard to study in the open ocean, we still do not know how common the bacteria are. More testing will show if the infection leads to more strandings or affects whole groups.
Long‑Term Research Pays Off
The study shows how valuable long‑term stranding programs are. Without years of collected data, these new bacteria might never have been discovered.