It has been suggested that some cases of SIDS may be related to Staphylococcus aureus and Escherichia coli infections. Diagnosis
Differential diagnosis
Some conditions that are often undiagnosed and could be confused with or comorbid with SIDS include:

medium-chain acyl-coenzyme A dehydrogenase deficiency (MCAD deficiency);
infant botulism;
long QT syndrome (accounting for less than 2% of cases);
Helicobacter pylori bacterial infections;
shaken baby syndrome and other forms of child abuse;
overlaying, child smothering during carers sleepFor example, an infant with MCAD deficiency might die by "classical SIDS" if found swaddled and prone, with its head covered, in an overheated room where parents were smoking. Genes indicating susceptibility to MCAD and Long QT syndrome do not protect an infant from dying of classical SIDS. Therefore, the presence of a susceptibility gene, such as for MCAD, means the infant might have died either from SIDS or from MCAD deficiency. It is currently impossible for a pathologist to distinguish between them. A 2010 study looked at 554 autopsies of infants in North Carolina that listed SIDS as the cause of death, and suggested that many of these deaths may have been due to accidental suffocation. The study found that 69% of autopsies listed other possible risk factors that could have led to death, such as unsafe bedding or sleeping with adults.Several instances of infanticide have been uncovered in which the diagnosis was originally SIDS.
A 2007 meta-analysis found that vaccinations were associated with a halving of the risk of SIDS, and argued that immunisation should be a part of SIDS prevention campaigns. Epidemiology
Globally, SIDS resulted in about 22,000 deaths as of 2010, down from 30,000 deaths in 1990. Rates vary significantly by population from 0.05 per 1000 in Hong Kong to 6.7 per 1000 in Native Americans.SIDS was responsible for 0.54 deaths per 1,000 live births in the US in 2005. It is responsible for far fewer deaths than congenital disorders and disorders related to short gestation, though it is the leading cause of death in healthy infants after one month of age. SIDS deaths in the US decreased from 4,895 in 1992 to 2,247 in 2004, a 54% decrease. During a similar time period, 1989 to 2004, SIDS as the cause of death for sudden infant death (SID) decreased from 80% to 55%, a 31% decrease. According to John Kattwinkel, chairman of the Centers for Disease Control and Prevention (CDC) Special Task Force on SIDS "A lot of us are concerned that the rate (of SIDS) isnt decreasing significantly, but that a lot of it is just code shifting". Race
In 2013, there were persistent disparities in SIDS deaths among racial and ethnic groups in the U.S. In 2009, the rates of death range from 20.3 per 100,000 live births for Asian/Pacific Islander to 119.2 per 100,000 live births for Native Americans/Alaska Native.