In most animals, body odor intensifies in moments of stress and danger. Humans
Sebaceous and apocrine glands become active at puberty. This, as well as many apocrine glands being close to the sex organs, points to a role related to mating. Compared to other primates, humans have extensive axillary hair and have many odor producing sources, in particular many apocrine glands. In women, the sense of olfaction is strongest around the time of ovulation, significantly stronger than during other phases of the menstrual cycle and also stronger than the sense in males.Humans can olfactorily detect blood-related kin. Mothers can identify by body odor their biological children, but not their stepchildren. Preadolescent children can olfactorily detect their full siblings, but not half-siblings or step-siblings, and this might explain incest avoidance and the Westermarck effect. Babies can recognize their mothers by smell while mothers, fathers, and other relatives can identify a baby by smell.Humans have few olfactory receptor cells compared to dogs and few functional olfactory receptor genes compared to rats. This is in part due to a reduction of the size of the snout in order to achieve depth perception as well as other changes related to bipedalism. However, it has been argued that humans may have larger brain areas associated with olfactory perception compared to other species.Studies have suggested that people might be using odor cues associated with the immune system to select mates.
The folds of the neck are most commonly affected, but other areas with skin folds are also susceptible, including the armpits, groin, and anus. Complications
Progression of intertrigo is dependent on the strain of streptococcus responsible for the symptoms. Streptococcal intertrigo can lead to complications if not appropriately diagnosed and treated in a timely manner. It has been reported that bacteremia, or a bacterial infection of the circulating blood, can occur which may require intravenous antibiotic therapy. Streptococcus pyogenes is also known to cause other serious diseases such as meningitis, necrotizing fasciitis, toxic shock syndrome, and osteomyelitis. Skin infections caused by Group A Beta-hemolytic streptococci (GABHS) can also be associated with acute glomerulonephritis, furthering the need for prompt diagnosis and treatment. Cause
Intertrigo is a skin condition often associated with rashes in deep skin folds with increased friction and moisture exposure. There are various causes that can lead to intertrigo including fungal and viral, although the agent would depend on the nature of the infection whether it be candidal or bacterial. In the case of bacterial infections, the main etiological agents are either group A beta hemolytic streptococci or Staphylococcus aureus. Group A streptococci (GAS) are ubiquitous microorganisms found in the surrounding environment and in the normal skin microbiota. Although there are different severities of infections Group A streptococci can affect individuals, broken skin and wounds allow easier access for colonization by the bacteria. The streptococci family has its own factors that aid in its promotion of infection and severity.