Mushroom soup is being recalled over concerns that it may contain larvae, according to the U.S. Food and Drug Administration.

The 24oz tubs of Hungarian Mushroom Soup were produced by Seattle-based Puget Consumers Co-op (PCC) and was sold to customers in Washington only.

PCC is voluntarily recalling 105 tubs, it announced on September 30, and the FDA set the recall at a Class II risk level on Tuesday, October 22.

That means the situation is one "in which use of or exposure to a violative product may cause temporary or medically reversible adverse health consequences, or where the probability of serious adverse health consequences is remote."

This is the second-highest risk classification, behind Class I which is issued in "a situation in which there is a reasonable probability that the use of or exposure to a violative product will cause serious adverse health consequences or death."

Class III is for when "a situation in which use of or exposure to a violative product is not likely to cause adverse health consequences."

Newsweek have approached PCC for comment via email.

Larvae are juvenile insects—for example, maggots and young flies—that, when eaten, can transfer a bacterial infection to the consumer.

For example, if the larvae have come into contact with Salmonella or Escherichia coli, or E. coli, bacteria, someone who ingests the larvae by mistake could experience food poisoning symptoms.

These symptoms may include stomach cramps, nausea, vomiting, diarrhea or fever.

Very rarely, live larvae can survive in the digestive tract as a parasite, in which case that individual would notice larvae in their stools. This is very uncommon in the U.S.

The mushroom soup was sold in containers with the product code "204522" and, as part of an 8lb bulk bag, with the lot code "427256" and "Enjoy By" date of November 11.

An outbreak of E. coli was connected to McDonald's Quarter Pounder hamburgers, leading to 10 hospitalizations and one death.

Cases of E. coli infection related to the burgers have been reported in nearly 50 people, across 10 states.

The Centers for Disease Control and Prevention has called the outbreak "a fast-moving outbreak investigation," and reported that slivered onions appear to be the source of the reported illness.

In response, McDonald's has stopped selling its Quarter Pounder burgers in restaurants across Colorado, Kansas, Utah and Wyoming, and parts of Idaho, Iowa, Missouri, Montana, Nebraska, Nevada, New Mexico and Oklahoma.

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