Viridans streptococci and Enterococci are the second and third most common organisms responsible for infective endocarditis. Viridans streptococci are a common cause of infective endocarditis in South America. Other Streptococci  are also a frequent cause. Infective endocarditis due to Streptococcus bovis occurs more commonly in Europe than in North America. HACEK group of bacteria are also rare causes of infective endocarditis in North America.The viridans group includes S. oralis, S. mitis, S. sanguis, S. gordonii and S. parasanguis. The primary habitats for these organisms are the oral cavity and upper respiratory tract. These bacteria are present in the normal oral flora and enter the bloodstream due to disruption of tissues in the mouth when dental surgical procedures are performed (tooth extractions) or genitourinary manipulation. Similarly, HACEK organisms are a group of bacteria that live on the dental gums and can be seen with people who inject drugs who contaminate their needles with saliva. Patients may also have a history of poor dental hygiene or pre-existing valvular disease.Viridans alpha-hemolytic streptococci, that are present in the mouth, are the most frequently isolated microorganisms when the infection is acquired in a community setting.
Hair diseases are disorders primarily associated with the follicles of the hair. A few examples are 

Alopecia
Bubble hair deformity
Hair casts
Hair loss
hypertrichosis
Ingrown hair
Monilethrix
Premature greying of hair
Pattern hair loss
Trichorrhexis invaginataMany hair diseases can be associated with distinct underlying disorders. Piedra are fungal diseases. Hair disease may refer to excessive shedding or baldness (or both). Balding can be localised or diffuse, scarring or non-scarring. Increased hair can be due to hormonal factors (hirsutism) or non-hormonal (hypertrichosis). Scalp disorders may or may not be associated with hair loss. See also
List of cutaneous conditions

References
External links

https://www.nlm.nih.gov/medlineplus/hairdiseasesandhairloss.html