Burkholderia (formerly Pseudomonas ) pseudomallei is a gram-negative bacillus isolated from soil, stagnant streams, ponds, rice paddies, and market produce in endemic areas and can cause epizootics in sheep, goats, swine, horses, and seals.[4,33,43,45,77] Humans contract disease from contamination of abrasions with soil but may also ingest or inhale organisms.[4,45] Melioidosis is endemic to southeast Asia and northern Australia, but it may occur anywhere between 20 degrees north and south latitudes.[4,45] It is most widespread in Thailand where it accounts for 19% of hospitalizations and 40% of deaths from community-acquired septicemia. Mild or subclinical infections are common; 80% of Thai children are seropositive by age five years.
The most commonly used AAS in medicine are testosterone and its various esters (but most commonly testosterone undecanoate , testosterone enanthate , testosterone cypionate , and testosterone propionate ),  nandrolone esters (most commonly nandrolone decanoate and nandrolone phenylpropionate ), stanozolol , and metandienone (methandrostenolone).  Others also available and used commonly but to a lesser extent include methyltestosterone , oxandrolone , mesterolone , and oxymetholone , as well as drostanolone propionate , metenolone (methylandrostenolone), and fluoxymesterone .  Dihydrotestosterone (DHT; androstanolone, stanolone) and its esters are also notable, although they are not widely used in medicine.  Boldenone undecylenate and trenbolone acetate are used in veterinary medicine .