LONDON, Ont. -- For the second time in less than a month, Health Canada is issuing a recall of medical marijuana.

Clearview, Ont.-based Peace Naturals Project issued a voluntary recall for a batch of its prescription pot (K-Farms Lot: K1-KFM-001-14) after it tested positive for bacteria outside the acceptable limits, Health Canada said.

The latest recall affects 55 of the roughly 40,000 medical marijuana users in Canada.

Though Peace Naturals hasn't received any reports of adverse health affects from clients using the recalled product, the company advises users to seek medical help if they have health concerns.

“Peace Naturals Project Inc. has contacted and is instructing the 55 clients who received the affected lot to immediately discontinue use of any marijuana from this lot which they may still have in their possession,” Health Canada said in a statement.

Clients are asked to return any unused product to the company or safely dispose of it.

Peace Naturals still appears on the government's list of approved producers.

The recall comes less than a month after B.C.-based Greenleaf Medicinals issued a voluntary recall of its Purple Kush strain April 18 following a Health Canada inspection that found problems with the company's control, production and oversight procedures.

Greenleaf no longer appears on the government-approved producer list.

dale.carruthers@sunmedia.ca

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BY THE NUMBERS

** 40,000 medical marijuana users in Canada

** 3M medical marijuana plants cultivated in Canada last year

** 31 medical conditions that can be treated with a marijuana prescription

** $1.3B estimated size of medical marijuana market by 2024

Sources: Health Canada, producer websites