The union is asking for an urgent meeting with Mr Johnston over planned regulatory changes that could lead to the third part of the Nursing and Midwifery register - the part for specialist public health nursing - closing.
Unite/CPHVA says that if this section of the register closes, recognition of the unique characteristics of public health practice will be lost.
Cheryll Adams, Unite/CPHVA acting lead professional officer, said: ‘Without the legal status of health visiting being protected, the door will be opened further for other less-qualified staff to take on these responsibilities.
‘This could mean that even more mothers with postnatal depression won't receive the support they deserve, families won't be helped through periods of crises and more children could become victims of family dysfunction.'
She added that health visiting was at a ‘critical crossroads' in its history.
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