N-glycosylation of infectious bronchitis virus M41 spike determines receptor specificity

Infection of chicken coronavirus infectious bronchitis virus (IBV) is initiated by binding of the viral heavily N-glycosylated attachment protein spike to the alpha-2,3-linked sialic acid receptor Neu5Ac. Previously, we have shown that N-glycosylation of recombinantly expressed receptor binding domain (RBD) of the spike of IBV-M41 is of critical importance for binding to chicken trachea tissue. Here we investigated the role of N-glycosylation of the RBD on receptor specificity and virus replication in the context of the virus particle. Using our reverse genetics system we were able to generate recombinant IBVs for nine-out-of-ten individual N-glycosylation mutants. In vitro growth kinetics of these viruses were comparable to the virus containing the wild-type M41-S1. Furthermore, Neu5Ac binding by the recombinant viruses containing single N-glycosylation site knock-out mutations matched the Neu5Ac binding observed with the recombinant RBDs. Five N-glycosylation mutants lost the ability to bind Neu5Ac and gained binding to a different, yet unknown, sialylated glycan receptor on host cells. These results demonstrate that N-glycosylation of IBV is a determinant for receptor specificity.

Principles for designing and delivering psychosocial and mental healthcare

The development of the UK’s military policy includes the potential for military organisations to deploy in support of humanitarian aid operations. This paper offers an overview of the risks to people’s mental health of their exposure to emergencies, major incidents, disasters, terrorism, displacement, postconflict environments in which humanitarian aid is delivered, and deployments to conflict zones. It summarises the psychosocial approach recommended by many contemporary researchers and practitioners. It differentiates the extremely common experience of distress from the mental disorders that people who are affected may develop and introduces the construct of psychosocial resilience. The authors recognise the importance of trajectories of response in separating people who are distressed and require psychosocial care from those who require mental healthcare. Finally, this paper summarises a strategic approach to designing, planning and providing psychosocial and mental healthcare, provides a model of care and outlines the principles for early psychosocial interventions that do not require training in mental healthcare to deliver them.

Deployment guidelines for diplomats: current policy and practice

BACKGROUND

Diplomatic organizations routinely send staff to high-threat postings (HTPs) and consequentially have moral and legal obligations to protect their health as far as is reasonably practicable.

AIMS

To carry out an international survey of diplomatic organizations that send personnel to HTPs to establish how they deal practically with their obligations to protect the mental health of their staff.

METHODS

An online anonymous survey about their organizations' policies relating to HTPs completed by international diplomatic organizations.

RESULTS

Fourteen of 30 organizations approached completed the questionnaire, with a response rate of 47%. Deployment length varied: no minimum (15%), a minimum of 2 years (39%) and a maximum of 2 (31%), 3 (15%) or 4 years (31%); one organization did not state any maximum. HTP and low-threat postings had the same policies in 46% of organizations. Additional care and support (66%), additional preparation (50%), enhanced leave (33%) and additional physical and mental health assessments were informally adopted to address psychosocial risks of deployment to HTPs.

CONCLUSIONS

There was little consensus on policies and practice for HTP deployment. We suggest that formal, consistently written guidelines, based on available quality evidence, and associated training and quality assurance should be formulated to make international practice more consistent and equitable.

A theoretical model for smoking prevention studies in preteen children

The age of the onset of smoking is on a continual decline, with the prime age of tobacco use initiation being 12-14 years. A weakness of the limited research conducted on smoking prevention programs designed for preteen children (ages 10-12) is a well-defined theoretical basis. A theoretical perspective is needed in order to make a meaningful transition from empirical analysis to application of knowledge. Bandura's Social Cognitive Theory (1977, 1986), the Theory of Reasoned Action (Ajzen & Fishbein, 1980), and other literature linking various concepts to smoking behaviors in preteens were used to develop a model that may be useful for smoking prevention studies in preteen children.

The relationship of illness longevity and relapse with self-perception, cancer stressors, anxiety, and coping strategies in children with cancer

A descriptive, correlational design was used to investigate the relationship of the longevity of the cancer experience and the presence of a relapse to the child's self-perception, cancer stressors, anxiety, and use of coping strategies. The 44 children included in this study were 6 1/2 to 13 1/2 years of age. Fifteen of the children had experienced a relapse of the disease either on or off therapy. The longevity of the cancer treatment and the presence of a relapse were negatively associated with the child's self-perception. Trait anxiety was positively associated with duration of the cancer experience and with the presence of a relapse. Longevity of the cancer experience and the presence of a relapse may be factors that signal the need for interventions designed to enhance the child's self-perception throughout treatment. Because children in this study who reported lower self-perception and higher trait anxiety levels also reported experiencing more cancer stressors, nursing efforts to develop innovative strategies designed to enhance patients' feelings of self-worth and decrease their anxiety may prove to be important contributions to the care of children receiving treatment for cancer.

Cancer stressors and protective factors: predictors of stress experienced during treatment for childhood cancer

Perceptions of cancer stressors and protective factors are predictors of stress experienced during treatment for childhood cancer were assessed in this study. Cancer stressors were the type of treatment received during two clinic visits and the child's perception of the cancer experience. Protective factors were self-perception, coping strategies, perceived social support, and family environment. The child's responses to stressors were assessed by epinephrine, norepinephrine, and cortisol levels of urine, and measures of state anxiety. Forty-four children between 6 1/2 and 13 1/2 years of age receiving treatment for cancer were evaluated during two clinic visits. Epinephrine was elevated for children during both clinic visits, while norepinephrine and cortisol remained normal. Stepwise multiple regression analyses revealed that the family environment and global self-worth were the best predictors of epinephrine levels, while social support from friends predicted norepinephrine levels. The family environment and social support from teachers predicted state anxiety.

Life change events and coping behaviors in families of children with cancer

This study investigated life change events and coping behaviors in families of children with cancer compared with those who have physically healthy children. The sample consisted of 21 families with a child with cancer and 17 families with physically healthy children. All the children in the study were 6 to 12 years of age. Parents from each group completed items from the Family Inventory of Life Events and Changes and the Family Crisis Oriented Evaluation Scales. These tools evaluate stressful life change events experienced by families within a 12-month period and coping behaviors used by families during difficult situations. Families with a child who has cancer experienced significantly more stressful life change events (t = 2.15, P = 0.04) than those with physically healthy children. There were no significant differences (t = 0.23, P = 0.82) in the coping behaviors that were used by the two groups. The results provided a clearer understanding of stressful life change events that impact families with a child with cancer.