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BCG vaccine should be given intradermally.
If given subcutaneously, it may induce local infection and spread to the regional lymph nodes, causing either suppurative and nonsuppurative lymphadenitis.
Conservative management is usually adequate for nonsuppurative lymphadenitis.
If suppuration occurs, it may need needle aspiration.
For nonresolving suppuration, surgical excision is required, but not incision.
Uncommonly, breast and gluteal abscesses can occur due to haematogenous and lymphangiomatous spread.
Regional bone infection ( BCG osteomyelitis or osteitis ) and disseminated BCG infection are rare complications of BCG vaccination, but potentially life threatening.
Systemic antituberculous therapy may be helpful in severe complications.

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