An investigation revealed that the formula contained a much lower quantity of Thiamine than is needed for healthy infant development because of a manufacturing error. Humana's chief food technologist received a 30-month prison sentence for negligent manslaughter in February 2013 over the case.[57] In 2010, Abbott Laboratories issued a voluntary recall of about five million Similac brand powder infant formulas that were sold in the United States, Guam, Puerto Rico and some Caribbean countries. The recall was issued after the presence of a 'small common beetle' was detected in the product.[58] In Canada, New Zealand and elsewhere, public concerns have been raised over the continued sale and marketing of soy-based formulae potentially containing high levels of phytoestrogens,[59][60] linked to abnormal child development[61] including damage to babies' thyroid glands.