Limit, short term protection

C. Prophylaxis/Vaccine. An effective inactivated vaccine is available in limited quantities. Protective antibodies begin to appear within 10-14 days and last for a year. A single injection is probably not protective, but two inoculations may provide marginal short-term protection. Ribavirin prophylaxis of the related sandfly fever virus was successful, but the dose used might be expected to produce anemia and other effects in some recipients. 

Maximum use concentration (MUC) means the maximum atmospheric concentration of a hazardous substance from which an employee can be expected to be protected when wearing a respirator, and is determined by the assigned protection factor of the respirator or class of respirators and the exposure limit of the hazardous substance. The MUC can be determined mathematically by multiplying the assigned protection factor specified for a respirator by the required QSHA permissible exposure limit, short-term exposure limit, or ceiling limit. When no QSHA exposure limit is available for a hazardous substance, an employer must determine an MUC on the basis of relevant available information and informed professional judgement. 

The adopted values for TWAs for airborne vanadium, including oxide and metal dusts of vanadium, is 0.5 mg/m the values for fumes of vanadium compounds is 0.05 mg/m. These limits are for normal 8-h workday and 40-h work-week exposures. The short-term exposure limit (STEL) is 1.5 mg/m for dusts (25). A description of health ha2ards, including symptoms, first aid, and organ involvement, personal protection, and respirator use has beenpubhshed (26). 

Health Hazards Information - Recommended Personal Protective Equipment Data not available Symptoms Following Exposure Irritating to skin and mucous membranes General Treatment for Exposure Data not available Toxicity by Inhalation (ThresholdLimit Value) Not pertinent Short-Term Exposure Limits Not pertinent Toxicity by Ingestion Grade 2 oral rat LDjq 3500 mg/kg Late Toxicity Not pertinent Vapor (Gas) Irritant Characteristics Not pertinent Liquid or Solid Irritant Characteristics Data not available Odor Threshold Not pertinent. 

Health Hazards Information — Recommended Personal Protective Equipment Dust mask goggles or face shield, rubber gloves Symptoms Following Exposure Inhalation of dust irritates nose and throat. Contact with eyes causes irritation General Treatment for Exposure INHALATION move to fresh air. EYES flush with water for 15 min Toxicity by Inhalation Data not available Short-Term Exposure Limits Data not available Toxicity by Ingestion Data not available Late Toxicity Data not available Vapor (Gas) Irritant Characteristics Data not available Liquid or Solid Irritant Characteristics Data not available Odor Threshold Data not available. 

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