This was previously a minor criterionEvidence of endocardial involvement with positive echocardiogram is defined as

Oscillating intracardiac mass on valve or supporting structures, in the path of regurgitant jets, or on implanted material in the absence of an alternative anatomic explanation, or
Abscess, or
New partial dehiscence of prosthetic valve or new valvular regurgitation (worsening or changing of preexisting murmur not sufficient)

Minor criteria
Predisposing factor: known cardiac lesion, recreational drug injection
Fever >38 °C
Vascular phenomena: arterial emboli, pulmonary infarcts, Janeway lesions, conjunctival hemorrhage
Immunological phenomena: glomerulonephritis, Oslers nodes, Roths spots, Rheumatoid factor
Microbiologic evidence: Positive blood culture (that doesnt meet a major criterion) or serologic evidence of infection with organism consistent with IE but not satisfying major criterion

Risk
Among people who do not use intravenous drugs and have a fever in the emergency department, there is a less than 5% chance of occult endocarditis. Mellors in 1987 found no cases of endocarditis nor of staphylococcal bacteremia among 135 febrile patients in the emergency room. The upper confidence interval for 0% of 135 is 5%, so for statistical reasons alone, there is up to a 5% chance of endocarditis among these patients. In contrast, Leibovici found that among 113 non-selected adults admitted to the hospital because of fever there were two cases (1.8% with 95%CI: 0% to 7%) of endocarditis.Among people who do use intravenous drugs and have a fever in the emergency department, there is about a 10% to 15% prevalence of endocarditis. This estimate is not substantially changed by whether the doctor believes the patient has a trivial explanation for their fever.
Only battery-operated devices are safe. Failure to use child safety plugs in all outlets, and keeping children away from electrical cords. Adjusting prongs of an electrical cord that are too wide or narrow them with your fingertips while simultaneously plugging the cord into the power mains. The power plug used in the UK and some Commonwealth countries provides limited protection (Type G, with the lower half of the live prongs insulated), but all others do not. Not following manufacturer safety instructions for electrical appliances. This includes not using and immediately unplugging any appliance with a damaged electrical cord. If this cannot be done safely (i.e. damage is too close to the plug), the circuit breaker should be turned off beforehand. Touching metallic areas of an AC electrical appliance while also simultaneously touching faucets, water pipes, another metallic AC appliance, or being even partly immersed in water (including wet feet). This could ground the body through metal or water, with the risk that a faulty appliance is electrically "hot" on its outside cover or chassis. Not installing Ground Fault Circuit Interrupter (GFCI) outlets or circuit breakers in all areas with plumbing, bare concrete flooring, exposed to the elements, or outdoors by a qualified electrician. (Many newer homes already have these devices pre-installed.) Running an extension cord from non-GFCI areas such as bedrooms and hallways defeats this safety feature. Oral burns (above) cannot be prevented by GFCI.