A major divide is between theories that attribute the difficulties to a low-level problem with auditory temporal processing, and those that propose there is a deficit in a specialised language-learning system. Other accounts emphasise deficits in specific aspects of learning and memory. It can be difficult to choose between theories because they do not always make distinctive predictions, and there is considerable heterogeneity among children with DLD. It has also been suggested that DLD may only arise when more than one underlying deficit is present. Developmental learning disorder in adults
Relatively little research has been conducted to test the outcomes of DLD in adults. In a study comparing 17 men with DLD to siblings without DLD, researchers found that the DLD men had normal intelligence with higher performance IQ than verbal IQ. The participants still exhibited a severe and persisting language disorder, severe literacy impairments, and significant deficits in theory of mind and phonological processing. Within the DLD cohort, higher childhood intelligence and language were associated with superior cognitive and language ability at final adult outcome. In their mid-thirties, the DLD cohort had significantly worse social adaptation (with prolonged unemployment and a paucity of close friendships and love relationships) compared with both their siblings and National Child Development Study (NCDS) control cohorts, matched on childhood IQ and social class. Self-reports showed a higher rate of schizotypal features but not schizoaffective disorder. Four DLD adults had serious mental health problems (two had developed schizophrenia).
Signs and symptoms
The most apparent symptom of pneumonic plague is coughing, often with hemoptysis (coughing up blood). With pneumonic plague, the first signs of illness are fever, headache, weakness and rapidly developing pneumonia with shortness of breath, chest pain, cough and sometimes bloody or watery sputum.The pneumonia progresses for two to four days and may cause respiratory failure and shock. Patients will die without early treatment, some within 36 hours. Initial pneumonic plague symptoms can often include the following:

Fever
Weakness
Headaches
NauseaRapidly developing pneumonia with:

Shortness of breath
Chest pain
Cough
Bloody or watery sputum (saliva and discharge from respiratory passages). Causes
Pneumonic plague can be caused in two ways: primary, which results from the inhalation of aerosolized plague bacteria, or secondary, when septicemic plague spreads into lung tissue from the bloodstream. Pneumonic plague is not exclusively vector-borne like bubonic plague; instead, it can be spread from person to person. There have been cases of pneumonic plague resulting from the dissection or handling of contaminated animal tissue. This is one of the types of plague formerly known as the Black Death. Treatment
Pneumonic plague is a very aggressive infection requiring early treatment, which must be given within 24 hours of first symptoms to reduce the risk of death. Streptomycin, gentamicin, tetracyclines and chloramphenicol are all able to kill the causative bacterium. Antibiotic treatment for seven days will protect people who have had direct, close contact with infected patients. Wearing a close-fitting surgical mask also protects against infection.The mortality rate from untreated pneumonic plague approaches 100%.